MAST: Move drizzlepac astroquery_utils upstream to astroquery.mast

Folks have found that the code in [astroquery_utils.py](https://github.com/spacetelescope/drizzlepac/blob/385c29ed4bc33030d5440d8b9877ad5ffa9518eb/drizzlepac/haputils/astroquery_utils.py#L23) should be moved upstream to astroquery to make them generally available. It would be very useful to make retrieve_observation available to everyone. It also might make sense to enable it to work well on AWS as well to pull the files from the right place easily.

Start by reviewing drizzlepac/haputils/astroquery_utils.py, especially retrieve_observation, and compare its behavior with the astroquery.mast interface. Clarify the intended upstream API and AWS behavior with maintainers; the work is done when the utility is generally available through astroquery.mast and the requested file retrieval works in the supported environments.

Written by the indexing model from the issue text.