[Feature] Add favorite implementation to studios and tags

[echo6ix]

Is your feature request related to a problem? Please describe.
Stash currently lacks the ability to favorite a studio or a tag.

Describe the solution you'd like
Implement to favorite a studio or a tag ala performer favorites

• Grid views (tags, studios)
  • Show favorite icon
• Add favorite filter (for tags, studios)

[IntoTheBlackHole]

Can't believe that tags favorite feature doesn't exist.
1000's of tags are messing up my stash. Favorite tags will help differentiate from automatically added tags.

[Dankonite]

Studios is already coming with the next update
#4675
added tag favoriting myself, I got the db and the grid cards setup for it, just need to figure out adding a filter for it, but coming soon!