Support web sockets with hyper binding

[ry]

Probably looks like this:

let { respondWith, request } = await httpConn.nextRequest();
let { ws, response } = Deno.serveWebsocket(request);
respondWith(response);
// use web standard ws

Should use tungstenite

Probably this should proceed #10210

[axetroy]

why not use something like upgrader for Upgrade the protocol?

Maybe such code is less intrusive, It can work well with the HTTP interface.

import { serve } from "https://deno.land/std/http/server.ts";
const s = serve({ port: 8000 });
console.log("http://localhost:8000/");

const upgrader = Deno.upgrader({
  maxBuff: 1024 * 1024 * 20
  // and other config
})

for await (const req of s) {
	if (req.url.pathname === '/v1/api/ws') {
          // upgrade protocol
		  const conn = upgrader.upgrade(req)
	  
		  for await (const msg of conn.readMessage()) {
			  // accpet message from client then echo hello world
			  conn.writeString("Hello World\n")
	      }
    } else {
		req.respond({ body: "Hello World\n" });
	}
}