simulate_gaussian_iv gains an additional option: return_gamma

[mlondschien]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 60.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 93.22%. Comparing base (457aeb3) to head (edb5fd0).
Report is 32 commits behind head on main.

Files with missing lines	Patch %	Lines
ivmodels/simulate.py	60.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #86      +/-   ##
==========================================
- Coverage   93.32%   93.22%   -0.11%     
==========================================
  Files          32       32              
  Lines        1604     1608       +4     
==========================================
+ Hits         1497     1499       +2     
- Misses        107      109       +2     

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