Feature request: add option to trash/bin old snapshots instead of permanently deleting them from Google Drive

[jant90]

First of all: thanks a lot for this awesome add-on! I would like to make a feature request: could you add an option to move old snapshots to the trash instead of permanently deleting them from Google Drive?

This would be way more fault-tolerant. If the user (or maybe even the addon, such as #53) makes a mistake and deletes the wrong backups he still has 30 days to recover it from the trash.

I realize this might not be preferred by users with very limited storage space but I'm using a shared drive that is part of my Workspace plan which has no storage quota (only a limit of 400.000 files). Therefore I would prefer trashing instead of permanently deleting snapshot so an option to choose the behavior of your add-on would be really nice.