Rescan recovery

• Additional options for "recover" operation:
  • --user=CRSid to target a single user without needing to scan all users for those marked for recovery
  • --rescan to scan for existing permissions and only add those remaining

To provide a repeatable operation that will even after timeouts eventually restore all a users permissions.

To solve issue encountered restoring for https://gitlab.developers.cam.ac.uk/uis/devops/gsuite/operational-documentation/-/issues/51

Closes: #32 (closed)