feat(cloudchannel): update the API

#### cloudchannel:v1

The following keys were added:
- resources.accounts.methods.listSubscribers.parameters.integrator.description
- resources.accounts.methods.listSubscribers.parameters.integrator.location
- resources.accounts.methods.listSubscribers.parameters.integrator.type
- resources.integrators.methods.listSubscribers.description
- resources.integrators.methods.listSubscribers.flatPath
- resources.integrators.methods.listSubscribers.httpMethod
- resources.integrators.methods.listSubscribers.id
- resources.integrators.methods.listSubscribers.parameterOrder
- resources.integrators.methods.listSubscribers.parameters.account.description
- resources.integrators.methods.listSubscribers.parameters.account.location
- resources.integrators.methods.listSubscribers.parameters.account.type
- resources.integrators.methods.listSubscribers.parameters.integrator.description
- resources.integrators.methods.listSubscribers.parameters.integrator.location
- resources.integrators.methods.listSubscribers.parameters.integrator.pattern
- resources.integrators.methods.listSubscribers.parameters.integrator.required
- resources.integrators.methods.listSubscribers.parameters.integrator.type
- resources.integrators.methods.listSubscribers.parameters.pageSize.description
- resources.integrators.methods.listSubscribers.parameters.pageSize.format
- resources.integrators.methods.listSubscribers.parameters.pageSize.location
- resources.integrators.methods.listSubscribers.parameters.pageSize.type
- resources.integrators.methods.listSubscribers.parameters.pageToken.description
- resources.integrators.methods.listSubscribers.parameters.pageToken.location
- resources.integrators.methods.listSubscribers.parameters.pageToken.type
- resources.integrators.methods.listSubscribers.path
- resources.integrators.methods.listSubscribers.response.$ref
- resources.integrators.methods.listSubscribers.scopes
- resources.integrators.methods.registerSubscriber.description
- resources.integrators.methods.registerSubscriber.flatPath
- resources.integrators.methods.registerSubscriber.httpMethod
- resources.integrators.methods.registerSubscriber.id
- resources.integrators.methods.registerSubscriber.parameterOrder
- resources.integrators.methods.registerSubscriber.parameters.integrator.description
- resources.integrators.methods.registerSubscriber.parameters.integrator.location
- resources.integrators.methods.registerSubscriber.parameters.integrator.pattern
- resources.integrators.methods.registerSubscriber.parameters.integrator.required
- resources.integrators.methods.registerSubscriber.parameters.integrator.type
- resources.integrators.methods.registerSubscriber.path
- resources.integrators.methods.registerSubscriber.request.$ref
- resources.integrators.methods.registerSubscriber.response.$ref
- resources.integrators.methods.registerSubscriber.scopes
- resources.integrators.methods.unregisterSubscriber.description
- resources.integrators.methods.unregisterSubscriber.flatPath
- resources.integrators.methods.unregisterSubscriber.httpMethod
- resources.integrators.methods.unregisterSubscriber.id
- resources.integrators.methods.unregisterSubscriber.parameterOrder
- resources.integrators.methods.unregisterSubscriber.parameters.integrator.description
- resources.integrators.methods.unregisterSubscriber.parameters.integrator.location
- resources.integrators.methods.unregisterSubscriber.parameters.integrator.pattern
- resources.integrators.methods.unregisterSubscriber.parameters.integrator.required
- resources.integrators.methods.unregisterSubscriber.parameters.integrator.type
- resources.integrators.methods.unregisterSubscriber.path
- resources.integrators.methods.unregisterSubscriber.request.$ref
- resources.integrators.methods.unregisterSubscriber.response.$ref
- resources.integrators.methods.unregisterSubscriber.scopes
- schemas.GoogleCloudChannelV1ChangeOfferRequest.properties.priceReferenceId.description
- schemas.GoogleCloudChannelV1ChangeOfferRequest.properties.priceReferenceId.type
- schemas.GoogleCloudChannelV1Entitlement.properties.priceReferenceId.description
- schemas.GoogleCloudChannelV1Entitlement.properties.priceReferenceId.type
- schemas.GoogleCloudChannelV1PurchasableOffer.properties.priceReferenceId.description
- schemas.GoogleCloudChannelV1PurchasableOffer.properties.priceReferenceId.type
- schemas.GoogleCloudChannelV1RegisterSubscriberRequest.properties.account.description
- schemas.GoogleCloudChannelV1RegisterSubscriberRequest.properties.account.type
- schemas.GoogleCloudChannelV1RegisterSubscriberRequest.properties.integrator.description
- schemas.GoogleCloudChannelV1RegisterSubscriberRequest.properties.integrator.type
- schemas.GoogleCloudChannelV1TransferableOffer.properties.priceReferenceId.description
- schemas.GoogleCloudChannelV1TransferableOffer.properties.priceReferenceId.type
- schemas.GoogleCloudChannelV1UnregisterSubscriberRequest.properties.account.description
- schemas.GoogleCloudChannelV1UnregisterSubscriberRequest.properties.account.type
- schemas.GoogleCloudChannelV1UnregisterSubscriberRequest.properties.integrator.description
- schemas.GoogleCloudChannelV1UnregisterSubscriberRequest.properties.integrator.type
- schemas.GoogleCloudChannelV1alpha1Entitlement.properties.priceReferenceId.description
- schemas.GoogleCloudChannelV1alpha1Entitlement.properties.priceReferenceId.type
- schemas.GoogleCloudChannelV1alpha1OpportunityEvent.description
- schemas.GoogleCloudChannelV1alpha1OpportunityEvent.id
- schemas.GoogleCloudChannelV1alpha1OpportunityEvent.properties.eventType.description
- schemas.GoogleCloudChannelV1alpha1OpportunityEvent.properties.eventType.enum
- schemas.GoogleCloudChannelV1alpha1OpportunityEvent.properties.eventType.enumDescriptions
- schemas.GoogleCloudChannelV1alpha1OpportunityEvent.properties.eventType.type
- schemas.GoogleCloudChannelV1alpha1OpportunityEvent.properties.opportunity.description
- schemas.GoogleCloudChannelV1alpha1OpportunityEvent.properties.opportunity.type
- schemas.GoogleCloudChannelV1alpha1OpportunityEvent.type
- schemas.GoogleCloudChannelV1alpha1SubscriberEvent.properties.opportunityEvent.$ref
- schemas.GoogleCloudChannelV1alpha1SubscriberEvent.properties.opportunityEvent.description

The following keys were changed:
- resources.accounts.methods.listSubscribers.description
- resources.accounts.methods.listSubscribers.parameters.account.description
- resources.accounts.methods.register.description
- resources.accounts.methods.register.parameters.account.description
- resources.accounts.methods.unregister.description
- resources.accounts.methods.unregister.parameters.account.description
- resources.accounts.resources.skuGroups.methods.list.parameters.pageToken.description
- resources.accounts.resources.skuGroups.resources.billableSkus.methods.list.parameters.pageToken.description
- resources.operations.methods.cancel.description
- schemas.GoogleCloudChannelV1ChangeParametersRequest.description
- schemas.GoogleCloudChannelV1CloudIdentityCustomerAccount.properties.owned.description
- schemas.GoogleCloudChannelV1CustomerEvent.properties.eventType.description
- schemas.GoogleCloudChannelV1EntitlementEvent.properties.eventType.description
- schemas.GoogleCloudChannelV1ListSkuGroupBillableSkusResponse.properties.nextPageToken.description
- schemas.GoogleCloudChannelV1ListSkuGroupsResponse.properties.nextPageToken.description
- schemas.GoogleCloudChannelV1alpha1ChannelPartnerEvent.properties.eventType.description
- schemas.GoogleCloudChannelV1alpha1CustomerEvent.properties.eventType.description
- schemas.GoogleCloudChannelV1alpha1EntitlementEvent.properties.eventType.description
- schemas.GoogleTypeDecimal.description
- schemas.GoogleTypePostalAddress.description
- schemas.GoogleTypePostalAddress.properties.addressLines.description
- schemas.GoogleTypePostalAddress.properties.administrativeArea.description
- schemas.GoogleTypePostalAddress.properties.postalCode.description
- schemas.GoogleTypePostalAddress.properties.sortingCode.description
- schemas.GoogleTypeTimeZone.properties.id.description
- schemas.GoogleTypeTimeZone.properties.version.description