Add support of @RunOnVirtualThread on class for websockets next

[Malandril]

This PR allows to configure the virtual thread execution model of the websockets next endpoints on the class with @RunOnVirtualThread .

    @RunOnVirtualThread
    @WebSocket(path = "/chat")
    public class ChatWebsocket {
        @OnTextMessage
        String text(String message) {
          ....
        }
    }

[mkouba]

Looks good but we'll need to update the docs as well: https://github.com/quarkusio/quarkus/blob/main/docs/src/main/asciidoc/websockets-next-reference.adoc?plain=1#L233-L251

[Malandril]

@mkouba I was wondering also, if it should fail if the annoted Class contains non-blocking methods ?

[github-actions]

🙈 The PR is closed and the preview is expired.

[mkouba]

@mkouba I was wondering also, if it should fail if the annoted Class contains non-blocking methods ?

Hm, we don't have this validation at the moment. I mean you can annotate a method that returns Uni and we don't fail 🤔. But we can add this validation later.

[mkouba]

Suggested change

	* All Methods in a class annotated with `@RunOnVirtualThread` are considered blocking and run on a virtual thread.
	* Methods declated on a class annotated with `@RunOnVirtualThread` are considered blocking.

[mkouba]

We should also update the bullet about Kotlin suspend functions...

Plus change the last bullet from "Methods annotated with @RunOnVirtualThread must execute on a virtual thread, each invocation spawns a new virtual thread." to something like "Methods annotated with @RunOnVirtualThread or declared on a class annotated with @RunOnVirtualThread must be executed on a virtual thread, each invocation spawns a new virtual thread."

[quarkus-bot]

Status for workflow Quarkus CI

This is the status report for running Quarkus CI on commit 890c787.

✅ The latest workflow run for the pull request has completed successfully.

It should be safe to merge provided you have a look at the other checks in the summary.

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[quarkus-bot]

Status for workflow Quarkus Documentation CI

This is the status report for running Quarkus Documentation CI on commit 890c787.

✅ The latest workflow run for the pull request has completed successfully.

It should be safe to merge provided you have a look at the other checks in the summary.

[mkouba]

@Malandril merged, thanks for your contribution!