Option to delete only non-public toots

[rugk]

Use case: My non-public toots may contain a little more personal data than my public ones. Thus, I want to archive my public toots.

Also previously requested in here. (see also the example script that has been posted)

[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.

[rugk]

shh #badbot 🔕🤖🔕 This is a feature I'd still like.

[codl]

Yeah, I would like to implement this when I can. I think it's a good heuristic

[DC7IA]

I have the opposite use case to @rugk's: I'd like to only have public toots deleted. :D