Allow auto import of server services in server routes

[larbish]

Currently server services need to be imported from virtual import #supabase/server.

Check documentation and code.

Could be a nice UX to allow auto import of those services.

[larbish]

@pi0 @Atinux

[pi0]

Here is an example how to register auto import presets for nitro: https://stackblitz.com/edit/github-tuyddi?file=module%2Fruntime%2Futils.nitro.ts,module%2Fmodule.ts

(usage is verbose and not depending on hooks, since we are working on some refactors, this is probably safest to implement for nitro at current RC)