Feature request: Offer a "dry-run" / "no-to-all" / "report" feature

[mcclure]

Kondo is really nice! But Say I don't want to let Kondo delete anything, right now. Say I just want to know how much space would it free up if I told it to delete all? If I run Kondo and say "n" every time it says

Projects cleaned: 0, Bytes deleted: 0.0B

Which is correct but not what I wanted to know.

I think the best way to implement this would be a --report-only that prints the names of all dirs it would delete if run with -a, then prints the total projects and bytes that would be deleted.