fix(rpc): infer path with route() and basePath()

[yusukebe]

This PR will make the RPC-mode infers the path type correctly, with app.basePath() and app.route():

const book = new Hono().post('/create', (c) => c.jsonT('test root'))
const api = new Hono().basePath('/v1').route('/book', book)

Will be handled as:

const res = await client.v1.book.create.$post()
// ...

Author should do the followings, if applicable

• Add tests
• Run tests
• yarn denoify to generate files for Deno