Performer custom fields (#5487)

* Backend changes
* Show custom field values
* Add custom fields table input
* Add custom field filtering
* Add unit tests
* Include custom fields in import/export
* Anonymise performer custom fields
* Move json.Number handler functions to api
* Handle json.Number conversion in api

pkg/image/import.go

@@ -274,7 +274,9 @@ func (i *Importer) createPerformers(ctx context.Context, names []string) ([]*mod
 		newPerformer := models.NewPerformer()
 		newPerformer.Name = name
 
-		err := i.PerformerWriter.Create(ctx, &newPerformer)
+		err := i.PerformerWriter.Create(ctx, &models.CreatePerformerInput{
+			Performer: &newPerformer,
+		})
 		if err != nil {
 			return nil, err
 		}