Add penis length and circumcision stats to performers. (#3627)

* Add penis length stat to performers.
* Modified the UI to display and edit the stat.
* Added the ability to filter floats to allow filtering by penis length.
* Add circumcision stat to performer.
* Refactor enum filtering
* Change boolean filter to radio buttons
* Return null for empty enum values
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Co-authored-by: WithoutPants <53250216+WithoutPants@users.noreply.github.com>

pkg/scraper/stashbox/stash_box.go

@@ -1009,7 +1009,7 @@ func (c Client) SubmitPerformerDraft(ctx context.Context, performer *models.Perf
 	if performer.FakeTits != "" {
 		draft.BreastType = &performer.FakeTits
 	}
-	if performer.Gender.IsValid() {
+	if performer.Gender != nil && performer.Gender.IsValid() {
 		v := performer.Gender.String()
 		draft.Gender = &v
 	}