feat: implement ConnInfo helper

[nakasyou]

I implemented ConnInfo helper for Node.js.

Example:

import { Hono } from 'hono'
import { serve } from '@hono/node-server'
import { getConnInfo } from '@hono/node-server/conninfo'

const app = new Hono()
app.get('/ip-address', c => c.text(`Your IP Address: ${getConnInfo(c).remote.address}`))

serve(app)

The helper uses env to get Node.js HTTP Bindings.
If you'd like to use env, you can write code like:

serve({
  fetch (req, server) {
    return app.get(req, { server })
  }
})

[yusukebe]

Hi @nakasyou

I'll review it but, should we upgrade hono package in the devDependecies?

[nakasyou]

@yusukebe probably yes.

[usualoma]

Good 👍

[yusukebe]

LGTM!

[yusukebe]

Hi @nakasyou

I've updated the branch to pass the CI. Looks good. Merging now. Thanks!