ENH: ipac.irsa to have SIA backend

[bsipocz]

This will need more convenience functions on top, as well as handling the duality that some datasets are SIA while others are already SIA2.

[codecov]

Codecov Report

Attention: 6 lines in your changes are missing coverage. Please review.

Comparison is base (6205887) 67.02% compared to head (c39384c) 66.33%.
Report is 69 commits behind head on main.

❗ Current head c39384c differs from pull request most recent head f8f36eb. Consider uploading reports for the commit f8f36eb to get more accurate results

Files	Patch %	Lines
astroquery/ipac/irsa/core.py	53.84%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2837      +/-   ##
==========================================
- Coverage   67.02%   66.33%   -0.69%     
==========================================
  Files         235      235              
  Lines       18157    18089      -68     
==========================================
- Hits        12169    12000     -169     
- Misses       5988     6089     +101     

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[bsipocz]

I'm running into some local issues with the docs build, so using the PR to see whether the plot/etc works as intended or not. Otherwise, this should be good to go, at least as the zeroth order addition, with further improvements planned in follow-up PRs.

[bsipocz]

I'm not sure what's going on with the 3.8 build, but it's unrelated and is present on main, too, so I would go ahead and merge this now.