Adding lunar coords

[wps2n]

Adds compatibility with lunar based observatories using a new keyword world to specify the earth or moon (defaults to earth). Also contains a z=30 theory model and zero foregrounds model.

Needs:
Better handling of time_per_day and lst_bin_size
Moon specific tests

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.69%. Comparing base (8b38f77) to head (a8faf92).
Report is 16 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #164      +/-   ##
==========================================
+ Coverage   98.62%   98.69%   +0.06%     
==========================================
  Files          15       15              
  Lines        1089     1147      +58     
==========================================
+ Hits         1074     1132      +58     
  Misses         15       15              

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[steven-murray]

Thank you very much @wps2n, this is a really cool addition!

Please see my few notes on the implementation -- otherwise this is very nice indeed :-)

[wps2n]

@steven-murray I've implemented your suggestions and updated the tests for coverage. Note, I made two pushes. There's an odd error happening with lunarsky in one of the test suites that didn't happen in the first push but now is despite not making any changes to the specific test in the second push. I'll look into that but if you want to review the other changes I think we're nearly ready to merge.

[steven-murray]

Thanks @wps2n this looks great! Let's get those tests passing and I think this is good to go!

[wps2n]

@steven-murray I passed the PR by Jonathan and made a couple final updates. I am not sure how you would prefer it be merged into main or if there's a couple more housekeeping steps in order. Let me know and I can send it through, or I suppose you can

[steven-murray]

Great! Thanks @wps2n