Added support for proxying websockets through the victim browser

[nt0xa]

Currently, websockets connections are not proxied through the victim's extension and are handled by the CursedChrome server. The MR implements several new RPC methods to fix this.

Changes:

• Added new onWebSocketConnection rule to AnyProxy to allow manipulation of WebSocket traffic.
• Updated the server code to handle WebSocket connections using the new onWebSocketConnection rule and added 2 new RPC methods: WS_MESSAGE and WS_CLOSE.
• Updated the background script of the extension by adding 3 new RPC methods: WS_CONNECT, WS_MESSAGE and WS_CLOSE.