Hard caps on creating projects/orgs/collections (#4430)

* implement backend limits on project creation

* implement collection, org creation hard caps

* Fix limit api

* Fix clippy

* Fix limits

* Update sqlx queries

* Address PR comments on user limit structure

* sqlx prepare and clippy

* fix test maybe

apps/labrinth/src/models/v3/mod.rs

@@ -16,4 +16,5 @@ pub mod sessions;
 pub mod shared_instances;
 pub mod teams;
 pub mod threads;
+pub mod user_limits;
 pub mod users;