Add github issue reporter.

[mkonda]

Add a reporter that will take each finding and create a GitHub issue for it.

Use the GitHub API.

Need to figure out auth. Probably do it with app token.

[omerlh]

Maybe worth using instead the new check API?

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.