allow http2

[alexfriesen]

This PR will allow passing createServer from node:http2. Additionally serverOptions will have more helpful types

[yusukebe]

Hi @alexfriesen !

Good feature! Looks nice! Merging now!

[runspired]

Nice! I'd previously got http2 working like this:

import { serve } from '@hono/node-server';
import { Hono } from 'hono';
import http2 from 'node:http2';

// ...

  const app = new Hono();

  serve({
    fetch: app.fetch,
    createServer: (_, requestListener) => {
      return http2.createSecureServer(
        {
          key: fs.readFileSync(`${__dirname}/localhost-privkey.pem`),
          cert: fs.readFileSync(`${__dirname}/localhost-cert.pem`),
        },
        requestListener
      );
    },
    port: options.port ?? DEFAULT_PORT,
    hostname: 'localhost',
  });