💡 Support Service Workers in wrangler types

[zhawtof]

Describe the feature you'd like
When using wrangler types --x-include-runtime support generating types for service workers. Today, it only generates a Fetcher, which does not include the typing needed to pull in functions.

Describe alternatives you've considered
The only option I can envision is hard-coding Service<Engine> into the output. If there is a better alternative, I'm all ears.

Additional context

wrangler.toml

services = [
  { service = "engine", binding = "ENGINE", entrypoint = "EngineService" }
]

You will see the following after running wrangler types --x-include-runtime.

worker-configuration.d.ts

interface Env {
	ENGINE: Fetcher;
}

Which means that any function that is referenced is not going to work with typed support

env.ENGINE.anyFunction()