Download Products with MastMissions

[snbianco]

This MR adds methods to MastMissions that allow users to retrieve and download products from the Missions-MAST API.

• Retrieve products for datasets with get_product_list
• Retrieve only unique products with get_unique_product_list
• Filter products based on extension and other properties with filter_products
• Download products with download_products
• Download a single product with download_file

A few notes:

• Added a setter for the mission property so that users can use the same MastMissions object to query multiple missions.
• Although not ideal, some values are hard-coded in (dataset_kwds and _default_ullyses_cols, for example). These are due to limitations in the API, and I've reported these problems internally at MAST.
• Added the missions_request_async function to services.py to handle API requests coming from MastMissions.

[codecov]

Codecov Report

Attention: Patch coverage is 91.48936% with 16 lines in your changes missing coverage. Please review.

Project coverage is 67.74%. Comparing base (04c6069) to head (d098e39).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
astroquery/mast/missions.py	93.42%	10 Missing ⚠️
astroquery/mast/services.py	86.95%	3 Missing ⚠️
astroquery/mast/observations.py	50.00%	2 Missing ⚠️
astroquery/mast/utils.py	88.88%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3155      +/-   ##
==========================================
+ Coverage   67.54%   67.74%   +0.20%     
==========================================
  Files         233      233              
  Lines       18493    18634     +141     
==========================================
+ Hits        12491    12624     +133     
- Misses       6002     6010       +8     

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[snbianco]

Tagging @astrojimig and @dr-rodriguez for visibility