[@hono/vite-dev-server] add bun websocket support

[youcefs21]

dev server does not run websocket:

import { Hono } from "hono";
import { createBunWebSocket } from "hono/bun";

const { upgradeWebSocket, websocket } = createBunWebSocket();

const app = new Hono();

const ws = app.get(
    "/ws",
    upgradeWebSocket((c) => {
        console.log("WebSocket connected");
        let intervalId: Timer;
        return {
            onOpen(_event, ws) {
                intervalId = setInterval(() => {
                    ws.send(new Date().toString());
                }, 200);
            },
            onClose() {
                clearInterval(intervalId);
            },
        };
    }),
);

export default {
    fetch: app.fetch,
    websocket,
};

desired behaviour: should connect to websocket server when new WebSocket("ws://localhost:5173/ws") is called
current behaviour: fetch requests work fine, websocket request hangs