[Feature] Performer tags

[echo6ix]

Is your feature request related to a problem? Please describe.
There are many performer attributes we cannot or should not cover with fields, because there are too many to list. But it would be beneficial to document these attributes in some way. Such as if a performer is AI generated, or if they have freckles.

Describe the solution you'd like
Performer tags, similar to Stash's implementation.

Additional context
These could also be synced with Stash when scraping a performer from a stash-box.