Description

Add actions for stale issues/PRs. Uses https://github.com/actions/stale. This will mark issues/PRs as stale after the default period with no activity (60 days), and then close them another 14 days after that if they're still stale.

Related issue

N/A

How has this been tested?

🚀

Checklist:

• Unit tests
  • Unit tests do not apply.
  • Unit tests have been added/modified and passed for this PR.
• Integration tests
  • Integration tests do not apply.
  • Integration tests have been added/modified and passed for this PR.
• Documentation
  • This PR introduces no user visible changes.
  • This PR introduces user visible changes and the corresponding documentation change has been made.
• Minor version bump
  • This PR introduces no new features.
  • This PR introduces new features, and there is a separate PR to bump the minor version since the last release already.
  • This PR bumps the version.