Add faster ZINB

[aloctavodia]

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 85.21739% with 17 lines in your changes are missing coverage. Please review.

Project coverage is 82.79%. Comparing base (8c25e21) to head (62d4dd9).

Files	Patch %	Lines
preliz/distributions/zi_negativebinomial.py	84.25%	17 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #359      +/-   ##
==========================================
+ Coverage   82.75%   82.79%   +0.04%     
==========================================
  Files          52       53       +1     
  Lines        5155     5156       +1     
==========================================
+ Hits         4266     4269       +3     
+ Misses        889      887       -2     

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