Add a JAX backend

[ConnorStoneAstro]

Users may now switch AstroPhot over to run in JAX, essentially full compatibility except a handful of models (i.e. the edgeon model)

[codecov]

Codecov Report

❌ Patch coverage is 94.78936% with 47 lines in your changes missing coverage. Please review.
✅ Project coverage is 92.21%. Comparing base (368f3d5) to head (4080894).
⚠️ Report is 37 commits behind head on dev.

Files with missing lines	Patch %	Lines
astrophot/backend_obj.py	95.76%	16 Missing ⚠️
astrophot/image/mixins/sip_mixin.py	42.85%	8 Missing ⚠️
astrophot/image/func/window.py	20.00%	4 Missing ⚠️
astrophot/image/mixins/data_mixin.py	76.92%	3 Missing ⚠️
astrophot/utils/conversions/functions.py	66.66%	3 Missing ⚠️
astrophot/fit/base.py	50.00%	2 Missing ⚠️
astrophot/fit/lm.py	91.30%	2 Missing ⚠️
astrophot/fit/scipy_fit.py	77.77%	2 Missing ⚠️
astrophot/plots/image.py	90.90%	2 Missing ⚠️
astrophot/models/airy.py	83.33%	1 Missing ⚠️
... and 4 more

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #272      +/-   ##
==========================================
+ Coverage   91.54%   92.21%   +0.66%     
==========================================
  Files         113      114       +1     
  Lines        5039     5444     +405     
==========================================
+ Hits         4613     5020     +407     
+ Misses        426      424       -2     

Flag	Coverage Δ
unittests	92.21% <94.78%> (+0.66%)	⬆️

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