Optionally create review comments

[adangel]

With #7 inline annotations are created, but they can't be commented or resolved. The PMD GitHub Action could add comments for each found violation when running on a pull request. This requires to only consider the modified files (#6).
See https://github.com/rody/pmd-review-github-action for the idea.

This should add a new input parameter for the action, which can switch on this feature. When review comments are created, no annotations should be created then.

See also #12 (comment)

[adangel]

This is similar to what https://github.com/mitchspano/sfdx-scan-pull-request does: "... generates in-line comments with the findings"

[abbas-v1]

Here's an example PR with comments
kemsakurai/mixcloud-java-api#5