ENH: adding list_collections to IRSA

[bsipocz]

This is to close #2940

note: the query may take long right now, but we'll cache the VOTABLE format for this query to work around astropy/pyvo#524

[codecov]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (893eae2) 66.81% compared to head (f55b116) 66.80%.

Files	Patch %	Lines
astroquery/ipac/irsa/core.py	25.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2952      +/-   ##
==========================================
- Coverage   66.81%   66.80%   -0.01%     
==========================================
  Files         237      237              
  Lines       18316    18320       +4     
==========================================
+ Hits        12237    12238       +1     
- Misses       6079     6082       +3     

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[bsipocz]

Hmm, hold back on this, cadc has a get_collections which returns a dictionary, maybe we should do that here, too? I'll investigate what we do cache on server side, it maybe more pragmatic to only have the quick results in a list_collections rather than waiting for a longer run for something like get_collections

cc @andamian to comment on the API plans.

[bsipocz]

Hmm, actally the cadc approach doesn't pull in an actual description, so I'm inclined towards merging this PR as is and have list_collections along with list_catalogs for IRSA. (actual descriptions we do have in the registry for these collections, but I definitely don't want to do a registry search for query_sia or for this module just right now)