[Feature] Batch Update Functionality for Groups

[SirCumAlot1988]

Is your feature request related to a problem? Please describe.
The option to add tags to a group has been added recently. I am using Stash for a long time now and thus have a lot of groups (in my case these are all movies as the function was called movies before). I would now like to add tags to all my groups/movies, but doing this by hand is cumbersome.

Describe the solution you'd like
It would be helpful to have a batch update functionality like it is available for performers. This way I could re-scrape the tags for all my movies which have a URL (i.e. most of them).

Describe alternatives you've considered
I do not really see an alternative other than doing it by hand.