Add bot to close stale issues

[EandrewJones]

There are a growing number of issues which are stale either because they've seen no action or they have been overcome by events (OBE). I recommend adding a bot to automatically track, flag, and eventually close stale issues to help keep this clean:

https://github.com/marketplace/actions/close-stale-issues

We would need to ensure this is Apache friendly, first. We could look to other Apache libraries to see what's used there.