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/system_features_model.go

@@ -48,6 +48,7 @@ func (m *SystemFeaturesReadModel) Query() *eventstore.SearchQueryBuilder {
 			feature_v2.SystemLoginDefaultOrgEventType,
 			feature_v2.SystemTriggerIntrospectionProjectionsEventType,
 			feature_v2.SystemLegacyIntrospectionEventType,
+			feature_v2.SystemUserSchemaEventType,
 		).
 		Builder().ResourceOwner(m.ResourceOwner)
 }
@@ -72,6 +73,8 @@ func (m *SystemFeaturesReadModel) reduceBoolFeature(event *feature_v2.SetEvent[b
 		dst = &m.system.TriggerIntrospectionProjections
 	case feature.KeyLegacyIntrospection:
 		dst = &m.system.LegacyIntrospection
+	case feature.KeyUserSchema:
+		dst = &m.system.UserSchema
 	}
 
 	*dst = FeatureSource[bool]{