fix: Fixes networking issues (#1958)

### Summary
- Puts back `EventSink.SocketConnect`.
- Reverts networking change to push the networking to a separate thread.
- Reverts changes to the firewall by removing the firewall queue.
- Fixes listeners not shutting down with the server.
- Fixes race condition causing connections to get stuck even after they are disposed.

> [!NOTE]
> **Developer Note**
> Networking has been reverted back to using the main thread instead of a background thread. This alleviated complexity and the requirement for concurrent queues all over the place.

Projects/Server/Main.cs

@@ -336,6 +336,8 @@ public static class Core
 
         World.WaitForWriteCompletion();
         World.ExitSerializationThreads();
+        PingServer.Shutdown();
+        TcpServer.Shutdown();
 
         if (!_crashed)
         {