Create a bot to automatically add GitHub issue labels based on commit prefixes

[thewtex]

See discussion here:

https://discourse.itk.org/t/github-issue-labels/1256/3

[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.

[thewtex]

We also may be able to add some labels based on matched file patterns with:

https://github.com/banyan/auto-label

e.g. area:ThirdParty.

[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.

[thewtex]

Wake up stale-bot. We want to labels things. We will wait until GitHub Actions is out of beta, though.

[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.