ENH: returning (Q)Table for Alma.query_sia

[bsipocz]

This has been pulled out from #3252. Also, based on the discussion, I added the enhanced_results kwarg, but again, this is an API change for whomever is using query_sia as they don't get a SIA2Results but a Table/QTable instead.

[codecov]

Codecov Report

Attention: Patch coverage is 83.33333% with 1 line in your changes missing coverage. Please review.

Project coverage is 69.09%. Comparing base (7494746) to head (02fda13).
Report is 13 commits behind head on main.

Files with missing lines	Patch %	Lines
astroquery/alma/core.py	83.33%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3261   +/-   ##
=======================================
  Coverage   69.09%   69.09%           
=======================================
  Files         232      232           
  Lines       19637    19642    +5     
=======================================
+ Hits        13568    13572    +4     
- Misses       6069     6070    +1     

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