adding rho jump proposals for free spectra

[astrolamb]

@Hazboun6 I finally got around to including your rho jump proposal code to e_e. I think it's important for those who are trying to model the monopole as free specs

[astrolamb]

Test failures are all linting issues for code I didn't develop :/

[AaronDJohnson]

@astrolamb can you update this PR?

[codecov-commenter]

Codecov Report

Merging #189 (8e9d9b7) into master (5e0f99d) will decrease coverage by 0.10%.
The diff coverage is 15.78%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #189      +/-   ##
==========================================
- Coverage   37.34%   37.23%   -0.11%     
==========================================
  Files          20       20              
  Lines        3950     3969      +19     
==========================================
+ Hits         1475     1478       +3     
- Misses       2475     2491      +16     

Impacted Files	Coverage Δ
enterprise_extensions/sampler.py	38.00% <12.50%> (-0.58%)	⬇️
enterprise_extensions/hypermodel.py	48.30% <33.33%> (-0.20%)	⬇️

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[astrolamb]

@AaronDJohnson all checks passed :)