Add ToString implementation to MultiplayerRoom for easier debug

osu.Game/Online/RealtimeMultiplayer/MultiplayerRoom.cs

@@ -50,5 +50,7 @@ public MultiplayerRoom(in long roomId)
         /// Request a lock on this room to perform a thread-safe update.
         /// </summary>
         public LockUntilDisposal LockForUpdate() => new LockUntilDisposal(writeLock);
+
+        public override string ToString() => $"RoomID:{RoomID} Host:{Host?.UserID} Users:{Users.Count} State:{State} Settings: [{Settings}]";
     }
 }