add scaled inverse chi2

[aloctavodia]

No description provided.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 60.15625% with 51 lines in your changes missing coverage. Please review.
✅ Project coverage is 48.80%. Comparing base (f25da81) to head (1097941).
⚠️ Report is 141 commits behind head on main.

Files with missing lines	Patch %	Lines
preliz/distributions/scaled_inverse_chi_squared.py	40.69%	51 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #687       +/-   ##
===========================================
- Coverage   82.23%   48.80%   -33.44%     
===========================================
  Files         101      106        +5     
  Lines        8020     8924      +904     
===========================================
- Hits         6595     4355     -2240     
- Misses       1425     4569     +3144     

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