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/limits.rs

@@ -0,0 +1,46 @@
+use actix_http::StatusCode;
+use actix_web::test;
+use labrinth::models::v3::user_limits::UserLimits;
+
+use crate::{
+    assert_status,
+    common::{
+        api_common::{Api, AppendsOptionalPat},
+        api_v3::ApiV3,
+    },
+};
+
+impl ApiV3 {
+    pub async fn get_project_limits(&self, pat: Option<&str>) -> UserLimits {
+        let req = test::TestRequest::get()
+            .uri("/v3/limits/projects")
+            .append_pat(pat)
+            .to_request();
+        let resp = self.call(req).await;
+        assert_status!(&resp, StatusCode::OK);
+        test::read_body_json(resp).await
+    }
+
+    pub async fn get_organization_limits(
+        &self,
+        pat: Option<&str>,
+    ) -> UserLimits {
+        let req = test::TestRequest::get()
+            .uri("/v3/limits/organizations")
+            .append_pat(pat)
+            .to_request();
+        let resp = self.call(req).await;
+        assert_status!(&resp, StatusCode::OK);
+        test::read_body_json(resp).await
+    }
+
+    pub async fn get_collection_limits(&self, pat: Option<&str>) -> UserLimits {
+        let req = test::TestRequest::get()
+            .uri("/v3/limits/collections")
+            .append_pat(pat)
+            .to_request();
+        let resp = self.call(req).await;
+        assert_status!(&resp, StatusCode::OK);
+        test::read_body_json(resp).await
+    }
+}

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;