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/tests/common/api_v3/mod.rs

@@ -8,6 +8,7 @@ use labrinth::LabrinthConfig;
 use std::rc::Rc;
 
 pub mod collections;
+pub mod limits;
 pub mod oauth;
 pub mod oauth_clients;
 pub mod organization;