PLT-6763 Implement user access tokens and new roles (server-side) (#6972)

* Implement user access tokens and new roles

* Update config.json

* Add public post permission to apiv3

* Remove old comment

* Fix model unit test

* Updates to store per feedback

* Updates per feedback from CS

store/layered_store.go

@@ -139,6 +139,10 @@ func (s *LayeredStore) Job() JobStore {
 	return s.DatabaseLayer.Job()
 }
 
+func (s *LayeredStore) UserAccessToken() UserAccessTokenStore {
+	return s.DatabaseLayer.UserAccessToken()
+}
+
 func (s *LayeredStore) MarkSystemRanUnitTests() {
 	s.DatabaseLayer.MarkSystemRanUnitTests()
 }