Resolve multiple object names at once (with batching)

[snbianco]

Support for resolving multiple object names at once with resolve_object(), including automatic batching into groups of up to 30 names per request to the service.

Some notes:

• I refactored the batching code into another utils function, _batched_request. I also use this function for getting products via MastMissions.get_product_list.
• I wanted to cause as few breaking changes as possible, so the format of the return depends on the value of the resolve_all flag and whether or not multiple objects are being passed in. I detail input combinations and what they return in the function docstring and the documentation.
• When passing in multiple objects, and an object can't be resolved for whatever reason, I opt to warn the user that that particular object was not resolved rather than fail the entire call. When passing in a single object, the call will fail with an error if the object can't be resolved.

[codecov]

Codecov Report

❌ Patch coverage is 98.57143% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 70.55%. Comparing base (e48e283) to head (2c588eb).
⚠️ Report is 19 commits behind head on main.

Files with missing lines	Patch %	Lines
astroquery/mast/utils.py	98.52%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3398      +/-   ##
==========================================
+ Coverage   70.50%   70.55%   +0.04%     
==========================================
  Files         232      232              
  Lines       19999    20019      +20     
==========================================
+ Hits        14101    14124      +23     
+ Misses       5898     5895       -3     

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[bsipocz]

I have one minor comment, otherwise it looks good.

There are also a bunch of super minor whitespace issues for the docs due to the changed printings, could you please fix those up, too?

[bsipocz]

Shouldn't be the return value be a list in all cases?

[snbianco]

Changed this to always return a list of results for simplicity. In MastMissions.get_product_list, we only return the responses in a list if they are the product of batching.

[bsipocz]

Thank you!