Add faster VonMises

[aloctavodia]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 97.56098% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 83.33%. Comparing base (d6a172b) to head (bb63fff).

Files	Patch %	Lines
preliz/distributions/vonmises.py	97.89%	2 Missing ⚠️
preliz/internal/optimization.py	90.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #376      +/-   ##
==========================================
+ Coverage   83.14%   83.33%   +0.18%     
==========================================
  Files          60       61       +1     
  Lines        5608     5687      +79     
==========================================
+ Hits         4663     4739      +76     
- Misses        945      948       +3     

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