Add fast InverseGamma

[aloctavodia]

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 83.80952% with 17 lines in your changes are missing coverage. Please review.

Project coverage is 83.65%. Comparing base (5835ae5) to head (d33feb3).

Files	Patch %	Lines
preliz/distributions/inversegamma.py	83.49%	17 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #382      +/-   ##
==========================================
+ Coverage   83.63%   83.65%   +0.02%     
==========================================
  Files          63       64       +1     
  Lines        5804     5854      +50     
==========================================
+ Hits         4854     4897      +43     
- Misses        950      957       +7     

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