Marginalizing gamma_in distributions of individual systems

[williyamshoe]

This PR:

• adds a feature to marginalize gamma_in distributions of individual systems at a population level.
• adds @ajshajib and @williyamshoe as contributors in the AUTHORS.rst.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (3ae7cd8) 99.38% compared to head (cc16c56) 99.38%.
Report is 3 commits behind head on main.

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Additional details and impacted files

@@           Coverage Diff           @@
##             main      #29   +/-   ##
=======================================
  Coverage   99.38%   99.38%           
=======================================
  Files          44       44           
  Lines        2262     2270    +8     
=======================================
+ Hits         2248     2256    +8     
  Misses         14       14           

Files	Coverage Δ
hierarc/LensPosterior/kin_constraints_composite.py	100.00% <100.00%> (ø)
hierarc/Likelihood/cosmo_likelihood.py	92.55% <ø> (ø)
hierarc/Likelihood/hierarchy_likelihood.py	98.32% <100.00%> (+0.06%)	⬆️
hierarc/Sampling/ParamManager/lens_param.py	100.00% <100.00%> (ø)
hierarc/Sampling/ParamManager/param_manager.py	100.00% <ø> (ø)

... and 2 files with indirect coverage changes

[williyamshoe]

From the code report, the tests fail because "Support for nose tests is deprecated". Likely due to version differences with current version of pytest (v8.0.0). Locally, my tests run fine (v7.4.3). I am unsure what the solution is. We can rewrite all our tests to conform to the new pytest version, or just use an older version.

[sibirrer]

From the code report, the tests fail because "Support for nose tests is deprecated". Likely due to version differences with current version of pytest (v8.0.0). Locally, my tests run fine (v7.4.3). I am unsure what the solution is. We can rewrite all our tests to conform to the new pytest version, or just use an older version.

I just pushed a change hopefully making the deprecations/failures go away. Hope this works if you re-sync the main branch into your PR