feat: implement user schema management (#7416)

This PR adds the functionality to manage user schemas through the new user schema service.
It includes the possibility to create a basic JSON schema and also provides a way on defining permissions (read, write) for owner and self context with an annotation.

Further annotations for OIDC claims and SAML attribute mappings will follow.

A guide on how to create a schema and assign permissions has been started. It will be extended though out the process of implementing the schema and users based on those.

Note:
This feature is in an early stage and therefore not enabled by default. To test it out, please enable the UserSchema feature flag on your instance / system though the feature service.

internal/api/grpc/feature/v2/converter.go

@@ -13,6 +13,7 @@ func systemFeaturesToCommand(req *feature_pb.SetSystemFeaturesRequest) *command.
 		LoginDefaultOrg:                 req.LoginDefaultOrg,
 		TriggerIntrospectionProjections: req.OidcTriggerIntrospectionProjections,
 		LegacyIntrospection:             req.OidcLegacyIntrospection,
+		UserSchema:                      req.UserSchema,
 	}
 }
 
@@ -22,6 +23,7 @@ func systemFeaturesToPb(f *query.SystemFeatures) *feature_pb.GetSystemFeaturesRe
 		LoginDefaultOrg:                     featureSourceToFlagPb(&f.LoginDefaultOrg),
 		OidcTriggerIntrospectionProjections: featureSourceToFlagPb(&f.TriggerIntrospectionProjections),
 		OidcLegacyIntrospection:             featureSourceToFlagPb(&f.LegacyIntrospection),
+		UserSchema:                          featureSourceToFlagPb(&f.UserSchema),
 	}
 }
 
@@ -30,6 +32,7 @@ func instanceFeaturesToCommand(req *feature_pb.SetInstanceFeaturesRequest) *comm
 		LoginDefaultOrg:                 req.LoginDefaultOrg,
 		TriggerIntrospectionProjections: req.OidcTriggerIntrospectionProjections,
 		LegacyIntrospection:             req.OidcLegacyIntrospection,
+		UserSchema:                      req.UserSchema,
 	}
 }
 
@@ -39,6 +42,7 @@ func instanceFeaturesToPb(f *query.InstanceFeatures) *feature_pb.GetInstanceFeat
 		LoginDefaultOrg:                     featureSourceToFlagPb(&f.LoginDefaultOrg),
 		OidcTriggerIntrospectionProjections: featureSourceToFlagPb(&f.TriggerIntrospectionProjections),
 		OidcLegacyIntrospection:             featureSourceToFlagPb(&f.LegacyIntrospection),
+		UserSchema:                          featureSourceToFlagPb(&f.UserSchema),
 	}
 }