More filters in admin "files" section

[Albirew]

Summary

In admin/files, it would be great to add a possibility to filter/delete orphan files (files from deleted notes or users) or files older than a relative date (x months/years old) in order to better maintain instances on relatively small servers.
Maybe allowing users (in my/drive) to do the same for their own files would be good too...

tl;dr: please add "filter per date" and "multiple selection" in user drive and admin files, and "purge orphan files" in admin files.

[Albirew]

Just to add some content, my misskey/files/ folder size weight 359.2GB because of server-side remote files cache (local files is 21.4MB), and api request admin/drive/cleanup did not reduce the size at all...