Add support for websockets

[clayrisser]

I am trying to create a graphql endpoint using this framework, but I need websockets to work for graphql subscriptions.

[clayrisser]

Solving the following issue would resolve this.

#191

[prabirshrestha]

+1 would love to have websocket support without creating yet another server.

[natew]

Agree this would be nice, only issue is we run Vite Connect server in dev, Hono in prod, so we'd need to somehow make that work. I guess just a onDevServer and onProdServer so people can implement themselves.