#347 Add two properties for comment author name and email

[Sapr0]

Added 2 new properties, which are similar with the COMMIT and TRIGGER equivalents

• GITHUB_PR_COMMENT_AUTHOR_NAME
• GITHUB_PR_COMMENT_AUTHOR_EMAIL

This can help if the comment owner is a privileged user (eg: Manager) Which can be different than the PR owner or commit owner.

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This change is