Register valid values with a.soar.Product attribute

[dstansby]

Fixes #33. I still need to work out how to add info from the FITS table to this.

[ebuchlin]

Yes, fits_dataset exists in SOAR TAP tables, but is missing some information present in cdf_dataset.

[dstansby]

I just took another look at this, and as you say there's not as much info in fits_dataset, in particular there doesn't seem to be a column we can use as the dataset description:

For now I might just scrape the dataset names without a description, as that's still an improvement.

[codecov-commenter]

Codecov Report

Base: 97.44% // Head: 97.63% // Increases project coverage by +0.18% 🎉

Coverage data is based on head (05350d9) compared to base (9e657a2).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #36      +/-   ##
==========================================
+ Coverage   97.44%   97.63%   +0.18%     
==========================================
  Files           4        4              
  Lines         196      211      +15     
==========================================
+ Hits          191      206      +15     
  Misses          5        5              

Impacted Files	Coverage Δ
sunpy_soar/client.py	100.00% <100.00%> (ø)
sunpy_soar/tests/test_sunpy_soar.py	100.00% <100.00%> (ø)

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[nabobalis]

Worth a unit test to check at least one product attr was registered?