Add Multi Gaussian Expansion model

[ConnorStoneAstro]

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[codecov]

Codecov Report

Attention: Patch coverage is 88.88889% with 10 lines in your changes missing coverage. Please review.

Project coverage is 79.91%. Comparing base (2e02c99) to head (3ec3b0c).
Report is 122 commits behind head on dev.

Files with missing lines	Patch %	Lines
astrophot/models/multi_gaussian_expansion_model.py	88.76%	10 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #234      +/-   ##
==========================================
+ Coverage   79.14%   79.91%   +0.76%     
==========================================
  Files          91       93       +2     
  Lines        7557     7805     +248     
==========================================
+ Hits         5981     6237     +256     
+ Misses       1576     1568       -8     

Flag	Coverage Δ
unittests	79.91% <88.88%> (?)

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