Merge AsyncUserSocks into AsyncUsers, make sockid AtomicUsize

Revise authentication logic to use constant time string comparison

Greatly reduce write locks on users hashmap,
particularly when authenticating messages attempt to optimistically load with a read lock

src/rs/server/src/handleget.rs

@@ -387,7 +387,7 @@ async fn handle_get_core(
 	} else if path.starts_with("/collection/") {
 		let name = &path["/collection/".len()..];
 		if let Ok(client) = pgpool.get().await {
-			if let Some(user) = users.write().await.load(&*client, name).await {
+			if let Some(user) = users.write().await.load(&*client, name, None).await {
 				let user = user.lock().await;
 				let pool = &user.data.pool;
 				let bound = &user.data.accountbound;