Refactor kwarg passing for feature classes

Right now a lot of the code assumes that every feature class will have a couple temporal cross validation attributes (`fake_today`, `start_date`, `end_date`, etc). This isn't the case for dispatch-level features, so there's a lot of unnecessary tracking and passing of kwargs.

It would be nice to come up with a cleaner way to pass kwargs to officer-level feature classes without forcing dispatch-level features to also have those kwargs, since they'll never use them.