Move table representation builder

[mwcraig]

Fixes #408.

The root cause of #408 was that the mechanism for allowing an astropy Table to read/write our custom models was built into the model classes and not run unless one instantiated each of the models. As a result, if you tried reading a PhotometryData table before you instantiated a camera and an observatory then the read would fail.

This PR fixes the issue by ensuring that the code to add the table representations is run when stellarphot is imported.

This issue is hard to test for because if any code anywhere in the test suite makes a Camera and an Observatory hen the test passes. To ensure that we are testing for this failure I added a special tox case for it and added a workflow that runs that test.

[mwcraig]

Marked as a draft to make sure we get #419 in first

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.91%. Comparing base (f297b73) to head (3f7ae4b).
Report is 158 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #420      +/-   ##
==========================================
+ Coverage   78.87%   78.91%   +0.04%     
==========================================
  Files          29       30       +1     
  Lines        3815     3823       +8     
==========================================
+ Hits         3009     3017       +8     
  Misses        806      806              

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[JuanCab]

Interesting fix. I can't claim to understand the tox aspects of this, but the logic seemed sound.

[JuanCab]

I'm not fully conversant in or even have any experience at all withtox. So I did look over the tox stuff and understand the idea, although I can't really be relied on to catch any bugs in it. :(

[mwcraig]

I was marginally surprised the tox changes worked 🤣

[JuanCab]

Nice solution to the testing problem.

The merge-base changed after approval.

[mwcraig]

@JuanCab -- is this OK to merge once tests pass?

[JuanCab]

@JuanCab -- is this OK to merge once tests pass?

Yep