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/limits.rs

@@ -0,0 +1,32 @@
+use common::api_v3::ApiV3;
+use common::database::USER_USER_PAT;
+use common::environment::{TestEnvironment, with_test_environment};
+
+use crate::common::api_common::ApiProject;
+
+pub mod common;
+
+#[actix_rt::test]
+pub async fn limits() {
+    with_test_environment(
+        None,
+        |test_env: TestEnvironment<ApiV3>| async move {
+            let api = &test_env.api;
+
+            let project_limits = api.get_project_limits(USER_USER_PAT).await;
+            assert_eq!(project_limits.current, 2);
+            assert!(project_limits.max < u64::MAX);
+
+            api.add_public_project(
+                "limit-test-project",
+                None,
+                None,
+                USER_USER_PAT,
+            )
+            .await;
+            let project_limits = api.get_project_limits(USER_USER_PAT).await;
+            assert_eq!(project_limits.current, 3);
+        },
+    )
+    .await;
+}