SHARD-1058: Add per-IP connection limit to WebSocket server

[S0naliThakur]

Linear: https://linear.app/shm/issue/SHARD-1058

Summary:

1. Introduced a new configuration option maxConnectionsPerIP to limit the number of concurrent WebSocket connections from a single IP address.
2. Updated the onConnection function to check the number of active connections per IP and close the socket if the limit is reached.
3. Periodic cleanup of stale connections.
4. Modified unit tests to accommodate the new IP connection limit functionality.