Workflow for monitoring issues for staleness

[h4l0gen]

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Description of issue or feature request:
GitHub action for closing stale issues.

Current behavior:

Expected behavior:
This will comment on stale issue and on inactivity close that issue after specified period of time.

[h4l0gen]

As per CNCF assessment criteria, we need to monitor stale issues. WDYT? If it looks good to you I would like to raise a PR.

[jku]

I don't see a benefit (to auto-closing) myself. Like in most open source projects, an issue not being worked on does not mean it's not valid issue....

[h4l0gen]

@jku The functionality works as follows:

• It comments on an issue after a specific period (e.g., one month) if there is no activity(comments or Pull request).
• If there's still no activity, it closes the issue after 15 days (modifiable) of reminder.

Benefits:

• Acts as a reminder for authors or maintainers about forgotten issues.
• Revisiting issues after a month may spark new implementation ideas as the project progresses.
• It will Encourages discussion for solutions upon receiving reminders.

This idea I have behind this enhancement, WDYT?