Add ChiSquared distribution

[aleicazatti]

No description provided.

[codecov-commenter]

Codecov Report

Merging #101 (21c5a35) into main (2a4877c) will increase coverage by 0.41%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #101      +/-   ##
==========================================
+ Coverage   72.56%   72.97%   +0.41%     
==========================================
  Files          15       15              
  Lines        1702     1728      +26     
==========================================
+ Hits         1235     1261      +26     
  Misses        467      467              

Impacted Files	Coverage Δ
preliz/distributions/__init__.py	100.00% <ø> (ø)
preliz/tests/test_distributions.py	100.00% <ø> (ø)
preliz/tests/test_maxent.py	100.00% <ø> (ø)
preliz/tests/test_mle.py	100.00% <ø> (ø)
preliz/distributions/continuous.py	98.35% <100.00%> (+0.06%)	⬆️

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