feat(spanner): update the API

#### spanner:v1

The following keys were added:
- resources.projects.resources.instances.resources.databases.methods.addSplitPoints.description
- resources.projects.resources.instances.resources.databases.methods.addSplitPoints.flatPath
- resources.projects.resources.instances.resources.databases.methods.addSplitPoints.httpMethod
- resources.projects.resources.instances.resources.databases.methods.addSplitPoints.id
- resources.projects.resources.instances.resources.databases.methods.addSplitPoints.parameterOrder
- resources.projects.resources.instances.resources.databases.methods.addSplitPoints.parameters.database.description
- resources.projects.resources.instances.resources.databases.methods.addSplitPoints.parameters.database.location
- resources.projects.resources.instances.resources.databases.methods.addSplitPoints.parameters.database.pattern
- resources.projects.resources.instances.resources.databases.methods.addSplitPoints.parameters.database.required
- resources.projects.resources.instances.resources.databases.methods.addSplitPoints.parameters.database.type
- resources.projects.resources.instances.resources.databases.methods.addSplitPoints.path
- resources.projects.resources.instances.resources.databases.methods.addSplitPoints.request.$ref
- resources.projects.resources.instances.resources.databases.methods.addSplitPoints.response.$ref
- resources.projects.resources.instances.resources.databases.methods.addSplitPoints.scopes
- schemas.AddSplitPointsRequest.description
- schemas.AddSplitPointsRequest.id
- schemas.AddSplitPointsRequest.properties.initiator.description
- schemas.AddSplitPointsRequest.properties.initiator.type
- schemas.AddSplitPointsRequest.properties.splitPoints.description
- schemas.AddSplitPointsRequest.properties.splitPoints.items.$ref
- schemas.AddSplitPointsRequest.properties.splitPoints.type
- schemas.AddSplitPointsRequest.type
- schemas.AddSplitPointsResponse.description
- schemas.AddSplitPointsResponse.id
- schemas.AddSplitPointsResponse.type
- schemas.AsymmetricAutoscalingOption.description
- schemas.AsymmetricAutoscalingOption.id
- schemas.AsymmetricAutoscalingOption.properties.overrides.$ref
- schemas.AsymmetricAutoscalingOption.properties.overrides.description
- schemas.AsymmetricAutoscalingOption.properties.replicaSelection.$ref
- schemas.AsymmetricAutoscalingOption.properties.replicaSelection.description
- schemas.AsymmetricAutoscalingOption.type
- schemas.AutoscalingConfig.properties.asymmetricAutoscalingOptions.description
- schemas.AutoscalingConfig.properties.asymmetricAutoscalingOptions.items.$ref
- schemas.AutoscalingConfig.properties.asymmetricAutoscalingOptions.type
- schemas.AutoscalingConfigOverrides.description
- schemas.AutoscalingConfigOverrides.id
- schemas.AutoscalingConfigOverrides.properties.autoscalingLimits.$ref
- schemas.AutoscalingConfigOverrides.properties.autoscalingLimits.description
- schemas.AutoscalingConfigOverrides.properties.autoscalingTargetHighPriorityCpuUtilizationPercent.description
- schemas.AutoscalingConfigOverrides.properties.autoscalingTargetHighPriorityCpuUtilizationPercent.format
- schemas.AutoscalingConfigOverrides.properties.autoscalingTargetHighPriorityCpuUtilizationPercent.type
- schemas.AutoscalingConfigOverrides.type
- schemas.BeginTransactionRequest.properties.mutationKey.$ref
- schemas.BeginTransactionRequest.properties.mutationKey.description
- schemas.CommitRequest.properties.precommitToken.$ref
- schemas.CommitRequest.properties.precommitToken.description
- schemas.CommitResponse.properties.precommitToken.$ref
- schemas.CommitResponse.properties.precommitToken.description
- schemas.ExecuteBatchDmlRequest.properties.lastStatements.description
- schemas.ExecuteBatchDmlRequest.properties.lastStatements.type
- schemas.ExecuteBatchDmlResponse.properties.precommitToken.$ref
- schemas.ExecuteBatchDmlResponse.properties.precommitToken.description
- schemas.ExecuteSqlRequest.properties.lastStatement.description
- schemas.ExecuteSqlRequest.properties.lastStatement.type
- schemas.Instance.properties.defaultBackupScheduleType.description
- schemas.Instance.properties.defaultBackupScheduleType.enum
- schemas.Instance.properties.defaultBackupScheduleType.enumDescriptions
- schemas.Instance.properties.defaultBackupScheduleType.type
- schemas.Instance.properties.replicaComputeCapacity.description
- schemas.Instance.properties.replicaComputeCapacity.items.$ref
- schemas.Instance.properties.replicaComputeCapacity.readOnly
- schemas.Instance.properties.replicaComputeCapacity.type
- schemas.InstanceReplicaSelection.description
- schemas.InstanceReplicaSelection.id
- schemas.InstanceReplicaSelection.properties.location.description
- schemas.InstanceReplicaSelection.properties.location.type
- schemas.InstanceReplicaSelection.type
- schemas.Key.description
- schemas.Key.id
- schemas.Key.properties.keyParts.description
- schemas.Key.properties.keyParts.items.type
- schemas.Key.properties.keyParts.type
- schemas.Key.type
- schemas.PartialResultSet.properties.precommitToken.$ref
- schemas.PartialResultSet.properties.precommitToken.description
- schemas.ReadWrite.properties.multiplexedSessionPreviousTransactionId.description
- schemas.ReadWrite.properties.multiplexedSessionPreviousTransactionId.format
- schemas.ReadWrite.properties.multiplexedSessionPreviousTransactionId.type
- schemas.ReplicaComputeCapacity.description
- schemas.ReplicaComputeCapacity.id
- schemas.ReplicaComputeCapacity.properties.nodeCount.description
- schemas.ReplicaComputeCapacity.properties.nodeCount.format
- schemas.ReplicaComputeCapacity.properties.nodeCount.type
- schemas.ReplicaComputeCapacity.properties.processingUnits.description
- schemas.ReplicaComputeCapacity.properties.processingUnits.format
- schemas.ReplicaComputeCapacity.properties.processingUnits.type
- schemas.ReplicaComputeCapacity.properties.replicaSelection.$ref
- schemas.ReplicaComputeCapacity.properties.replicaSelection.description
- schemas.ReplicaComputeCapacity.type
- schemas.ResultSet.properties.precommitToken.$ref
- schemas.ResultSet.properties.precommitToken.description
- schemas.SplitPoints.description
- schemas.SplitPoints.id
- schemas.SplitPoints.properties.expireTime.description
- schemas.SplitPoints.properties.expireTime.format
- schemas.SplitPoints.properties.expireTime.type
- schemas.SplitPoints.properties.index.description
- schemas.SplitPoints.properties.index.type
- schemas.SplitPoints.properties.keys.description
- schemas.SplitPoints.properties.keys.items.$ref
- schemas.SplitPoints.properties.keys.type
- schemas.SplitPoints.properties.table.description
- schemas.SplitPoints.properties.table.type
- schemas.SplitPoints.type

The following keys were changed:
- endpoints
- resources.projects.resources.instanceConfigs.resources.operations.methods.cancel.description
- resources.projects.resources.instanceConfigs.resources.ssdCaches.resources.operations.methods.cancel.description
- resources.projects.resources.instances.resources.backups.methods.create.parameters.encryptionConfig.kmsKeyNames.description
- resources.projects.resources.instances.resources.backups.methods.getIamPolicy.description
- resources.projects.resources.instances.resources.backups.methods.setIamPolicy.description
- resources.projects.resources.instances.resources.backups.methods.testIamPermissions.description
- resources.projects.resources.instances.resources.backups.resources.operations.methods.cancel.description
- resources.projects.resources.instances.resources.databaseOperations.methods.list.parameters.filter.description
- resources.projects.resources.instances.resources.databases.methods.getIamPolicy.description
- resources.projects.resources.instances.resources.databases.methods.setIamPolicy.description
- resources.projects.resources.instances.resources.databases.methods.testIamPermissions.description
- resources.projects.resources.instances.resources.databases.resources.backupSchedules.methods.getIamPolicy.description
- resources.projects.resources.instances.resources.databases.resources.backupSchedules.methods.setIamPolicy.description
- resources.projects.resources.instances.resources.databases.resources.backupSchedules.methods.testIamPermissions.description
- resources.projects.resources.instances.resources.databases.resources.databaseRoles.methods.testIamPermissions.description
- resources.projects.resources.instances.resources.databases.resources.operations.methods.cancel.description
- resources.projects.resources.instances.resources.databases.resources.sessions.methods.executeSql.description
- resources.projects.resources.instances.resources.databases.resources.sessions.methods.executeStreamingSql.description
- resources.projects.resources.instances.resources.instancePartitionOperations.methods.list.parameters.instancePartitionDeadline.description
- resources.projects.resources.instances.resources.instancePartitions.resources.operations.methods.cancel.description
- resources.projects.resources.instances.resources.operations.methods.cancel.description
- schemas.Backup.properties.encryptionInformation.description
- schemas.BackupSchedule.description
- schemas.CopyBackupEncryptionConfig.properties.kmsKeyNames.description
- schemas.CreateBackupEncryptionConfig.properties.kmsKeyNames.description
- schemas.CreateInstanceConfigRequest.description
- schemas.CrontabSpec.properties.text.description
- schemas.Database.properties.encryptionInfo.description
- schemas.EncryptionConfig.properties.kmsKeyNames.description
- schemas.ExecuteSqlRequest.properties.queryMode.enum
- schemas.ExecuteSqlRequest.properties.queryMode.enumDescriptions
- schemas.QueryPlan.properties.queryAdvice.description
- schemas.RestoreDatabaseEncryptionConfig.properties.kmsKeyNames.description
- schemas.Type.properties.code.enum
- schemas.Type.properties.code.enumDescriptions
- schemas.Type.properties.typeAnnotation.enum
- schemas.Type.properties.typeAnnotation.enumDescriptions
- schemas.UpdateDatabaseDdlRequest.properties.operationId.description
- schemas.UpdateInstanceConfigRequest.description