[v15] backport common decision service elements (#51610)

* Add initial Decision (aka PDP) protos (#49875)

* Clone protos from fspmarshall/pdp-work-02

* Use decisionpb as the Go package alias

* Update DecisionService docs

* Split identity protos into separate files

* Update Metadata docs

* Split metadata into separate files

* Update Resource docs

* Update database access docs and fields

* Update SSH access docs and fields

* Ignore breaking changes on decision protos

* Update generated protos

* Use teleport.trait.v1.Trait

* Document mutual dependency between "ResourceID" types

* nit: s/ResourceID/ResourceId

* nit: Use the correct CamelCase field name in comments

* Update generated protos

* Add RouteToApp.target_port

* Update generated protos

* Update comments on TLSIdentity / tlsca.Identity

* Update generated protos

* Add the decisionv1.Service boilerplate (#49912)

* Add the decisionv1.Service boilerplate

* Wire decisionv1.Service to auth.GRPCServer

* Wire decisionpb.DecisionServiceClient to client.Client

* Add basic service testing

* Add conversions to/from decisionpb.TLSIdentity (#50308)

* Add conversions to/from decisionpb.TLSIdentity

* Map timestamppb.Timestamp{} to 0-0-0 0:0.0 (instead of unix epoch)

* Document that slices are not deep-copied

* Add EvaluateDatabaseAccessRequest.database (#50481)

* Add EvaluateDatabaseAccessRequest.database

* Update generated protos

* fix protos & tls identity

---------

Co-authored-by: Alan Parra <alan.parra@goteleport.com>

api/client/client.go

@@ -69,6 +69,7 @@ import (
 	crownjewelv1 "github.com/gravitational/teleport/api/gen/proto/go/teleport/crownjewel/v1"
 	dbobjectv1 "github.com/gravitational/teleport/api/gen/proto/go/teleport/dbobject/v1"
 	dbobjectimportrulev1 "github.com/gravitational/teleport/api/gen/proto/go/teleport/dbobjectimportrule/v1"
+	decisionpb "github.com/gravitational/teleport/api/gen/proto/go/teleport/decision/v1alpha1"
 	devicepb "github.com/gravitational/teleport/api/gen/proto/go/teleport/devicetrust/v1"
 	discoveryconfigv1 "github.com/gravitational/teleport/api/gen/proto/go/teleport/discoveryconfig/v1"
 	externalauditstoragev1 "github.com/gravitational/teleport/api/gen/proto/go/teleport/externalauditstorage/v1"
@@ -5314,3 +5315,9 @@ func (c *Client) UpsertUserPreferences(ctx context.Context, in *userpreferencesp
 func (c *Client) ResourceUsageClient() resourceusagepb.ResourceUsageServiceClient {
 	return resourceusagepb.NewResourceUsageServiceClient(c.conn)
 }
+
+// DecisionClient returns an unadorned DecisionService client using the
+// underlying Auth gRPC connection.
+func (c *Client) DecisionClient() decisionpb.DecisionServiceClient {
+	return decisionpb.NewDecisionServiceClient(c.conn)
+}