feature: Access Crossws publish and peers via useNitroApp / useNuxtApp

Describe the feature

I reading through the Nitro source code and noticed the following snippet in nitro-dev.ts:

if (import.meta._websocket) {
  const { handleUpgrade } = wsAdapter(nitroApp.h3App.websocket);
  server.on("upgrade", handleUpgrade);
}

Similar code exists in other runtimes as well. Of course, other V2 and V3 versions have such code.

Previously, I [mentioned](https://github.com/unjs/community/discussions/65#discussioncomment-12440854) that I’d like Nuxt to support Crossws adapters.
My main goal is to access peers and be able to publish to any channel.

I also noticed that Crossws retrieves hooks dynamically, but the peers are still stored in the same Set.

Would it make sense to inject the publish and peers from wsAdapter into the event context, or alternatively make them accessible via useNitroApp?
And in the case of Nuxt, ideally via useNuxtApp.

I’d be happy to help with implementing this, but I’m not sure where to start.
Thanks!

I use translation software for communication.

Additional information

• Would you be willing to help implement this feature?

Start with src/presets/_nitro/runtime/nitro-dev.ts and compare the other runtimes that call wsAdapter with nitroApp.h3App.websocket. Investigate whether publish and peers should be exposed through the event context, useNitroApp, or useNuxtApp. Done means the chosen interface provides access to peers and publishing to any channel.