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/query/projection/instance_features.go

@@ -71,6 +71,10 @@ func (*instanceFeatureProjection) Reducers() []handler.AggregateReducer {
 				Event:  feature_v2.InstanceLegacyIntrospectionEventType,
 				Reduce: reduceInstanceSetFeature[bool],
 			},
+			{
+				Event:  feature_v2.InstanceUserSchemaEventType,
+				Reduce: reduceInstanceSetFeature[bool],
+			},
 			{
 				Event:  instance.InstanceRemovedEventType,
 				Reduce: reduceInstanceRemovedHelper(InstanceDomainInstanceIDCol),