WebSocket API

[QuiiBz]

We should add support for the WebSocket API.

MDN docs: https://developer.mozilla.org/en-US/docs/Web/API/WebSocket
Cloudflare Workers docs: https://developers.cloudflare.com/workers/learning/using-websockets/

[aabbdev]

Websocket should be implemented with cross domains to have several domains on the same port and we should also use the "socket reuse port" function to scale on several processes