implement fitting sequence

[ahuang314]

1. Implements FittingSequence along with all of the samplers that are used in lenstronomy, with the exception of "psf_iteration", which does not work in jaxtronomy since ImageModel.update_psf is not implemented, and "calibrate_images", since joint-linear is not supported in jaxtronomy. Support for the Jaxopt minimizer has been added to FittingSequence. The rest of the file is copy-pasted from lenstronomy.
2. Small changes in LikelihoodModule: default value of check_bounds has been changed to True to stay consistent with lenstronomy (not sure why I changed it to False in the first place), and fixed compatibility issues with Cobaya by converting the jax float to a numpy float in the likelihood() function.
3. Renamed the ImageData.exp_map variable to ImageData.exposure_map to stay consistent with lenstronomy (not sure how I got the name incorrect the first time)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.85%. Comparing base (477b114) to head (29a406e).
Report is 30 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff            @@
##             main      #35    +/-   ##
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  Coverage   99.84%   99.85%            
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  Files          48       49     +1     
  Lines        3809     4065   +256     
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+ Hits         3803     4059   +256     
  Misses          6        6            

Files with missing lines	Coverage Δ
jaxtronomy/Data/image_noise.py	100.00% <100.00%> (ø)
jaxtronomy/Data/imaging_data.py	100.00% <ø> (ø)
jaxtronomy/Sampling/likelihood.py	100.00% <100.00%> (ø)
jaxtronomy/Workflow/fitting_sequence.py	100.00% <100.00%> (ø)

[sibirrer]

Thank you @ahuang314 !