Move maven-compat to jsr330

[gnodet]

The goal of this PR is to completely get rid of old plexus annotations / plugins.
This requires moving maven-compat and the only remaining plexus components to JSR330.

[michael-o]

Interesting..didn't we say we won't touch compat anymore?

[slachiewicz]

Unfortunately we can't just drop this dependency

[michael-o]

Unfortunately we can't just drop this dependency

So this is an intermediate step to ease the pain?

[gnodet]

Unfortunately we can't just drop this dependency

So this is an intermediate step to ease the pain?

Yes, as I said, my goal was to clean the build, it just happens I had to get rid of old plexus plugin and I needed to move maven-compat to jsr330 for that. Quite a big work for a small goal, I agree.

That said, as the number of plugins using the org.apache.maven.repository.RepositorySystem is going down, we may be able to make maven-compat optional at some point. I'll work on a separate draft PR to see how/if this can be achieved.

[gnodet]

Superseded by #1150