Add watchFiles option to allow maven restart on external file changes

[xstefank]

Fixes #49558

[gsmet]

Thanks! I haven't looked at the patch yet but here is a quick comment.

[gsmet]

I'm not exactly excited at the idea of adding yet another dependency to a Commons jar to our own code, especially since it looks relatively simple to do without, except if I'm missing something?

Just initialize a common ArrayList collector and pass it to both methods. That's more in line with what we have elsewhere.

[xstefank]

Haha, I didn't introduce any new dependency :) Someone already snuck it in so I just reused :)

[gsmet]

Yeah a lot of Commons stuff are around due to our Maven dependencies. I will spend some time adding some bans soon.

[quarkus-bot]

Status for workflow Quarkus CI

This is the status report for running Quarkus CI on commit d268676.

✅ 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.

You can consult the Develocity build scans.

[aloubyansky]

Thanks @xstefank

[aloubyansky]

This could be documented

[xstefank]

🤦 will do that asap. I will also write a blog post tomorrow.