Add support for ping message callbacks to WebSockets Next

[emattheis]

This PR adds an @OnPingMessage companion to @OnPongMessage for WebSockets Next endpoints. This is useful for endpoints that want to observe ping frames arriving from remote parties. Under the covers it uses the Vert.x frameHandler.

[quarkus-bot]

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[github-actions]

🎊 PR Preview 9943ebd has been successfully built and deployed to https://quarkus-pr-main-45180-preview.surge.sh/version/main/guides/

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[quarkus-bot]

Status for workflow Quarkus Documentation CI

This is the status report for running Quarkus Documentation CI on commit d566dfc.

✅ 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.