Delete from trash after n days

[nagarrido]

Describe the enhancement you'd like
A clear and concise description of what you want to happen.

It would be nice to have an option to delete from the trash, after n days. The number n should be configurable by the admin, and an option to disable the feature should also be available (for example, set n=-1).

Describe why this will benefit the LibrePhotos
A clear and concise explanation on why this will make LibrePhotos better.

The file system starts getting a lot of clutter after some months, and file organization becomes difficult with so many photos in the trash interfering with the rest of the photos. To solve this one has to empty the trash, but one may not want to delete recently trashed photos yet. So permanently removing photos that have been on the trash for more than n days would be a nice solution to this.

Additional context
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This would also help to save space witout having to empty the trash manually.