Add fast StudentT and HalfStudentT

[aloctavodia]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 83.72093% with 42 lines in your changes are missing coverage. Please review.

Project coverage is 83.25%. Comparing base (64a2bb1) to head (91c6a72).

Files	Patch %	Lines
preliz/distributions/studentt.py	78.22%	27 Missing ⚠️
preliz/distributions/halfstudentt.py	85.84%	15 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #379      +/-   ##
==========================================
- Coverage   83.33%   83.25%   -0.08%     
==========================================
  Files          61       63       +2     
  Lines        5687     5804     +117     
==========================================
+ Hits         4739     4832      +93     
- Misses        948      972      +24     

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