Feature Request: Support `cs2pr` for annotating GitHub pull requests

[johnbacon]

staabm/annotate-pull-request-from-checkstyle turns checkstyle-based XML reports into pull request comments. Because all it needs is that checkstyle format, it already supports PHP_CodeSniffer, PHP-CS-Fixer, and Pint.

We're trying to hack at this for our project via duster.json configuration and perhaps CI-specific commands, but it would be great if there were official support!

[driftingly]

That would be cool, if you get it working via duster.json to give me an idea of how I might implement it.