[Feature] Extend gender filter options on /performers

[armbyants]

Is your feature request related to a problem? Please describe.
I'd like to be able to filter /performers by gender using boolean operators other than exact match. Today, I have to select between Male, Female, Transgender Male, etc. (screenshot below). I'd like to be able to filter for IS NULL, IS NOT male. etc.

A specific use case that I often run into is when new performers have been created with default null gender (such as being added during a scrape), and I want to find all performers without stashIDs that I haven't already organized. I'd like to be able to add stashID IS NULL and (gender IS NULL or gender IS NOT MALE) filter options to find them.

Describe the solution you'd like
Extend performer gender filter matching logic to match others such as URL or checksum

TL;DR

I want the above filter logic options (or at least an option to match NULL) for gender in /performers.

Happy to provide more context if helpful. Cheers 🎉

[stg-annon]

#2394

[WithoutPants]

Duplicate of #2394