Expose Category and Group IDs to admins

[JammyDodger]

My vote for the data explorer would be for more user_id style parameters like this feature request for groups:

Wishlist: param dropdown for data explorer query

I’d love to be able to specify something like this: -- [params] -- groups.id :group_id to get a parameter input that’s a dropdown of groups. I’ve named the value group_id here because I assume that’s what such a dropdown would give me.