Dev-mode: Add property/parameter to define extra files to watch for changes

[famod]

Description
As discussed here with @geoand: https://quarkusio.zulipchat.com/#narrow/stream/187038-dev/topic/Dev.20mode.20not.20reloading.20.22application-shared.2Eyaml.22/near/198171450

I wonder if it makes sense to expose an property that would take a list of extra files that should be watched in dev mode

Implementation ideas
AFAICS a regex would be the most versatile solution. Or even a list of regex.

[gsmet]

I think I would stick to the existing mechanism (i.e. no regexps, just a simple path) for a first version.

That would be quite easy to do IMHO.

The idea would be to add a configuration property listing some files and creating HotDeploymentWatchedFileBuildItem from there.

[famod]

I posted some questions about this in the chat: https://quarkusio.zulipchat.com/#narrow/stream/187038-dev/topic/BuildStep.20based.20on.20config.3F.20(implementing.20.2310234)