add logitnormal distribution

[aloctavodia]

• The entropy is approximated to the one from the normal, will fix in a separated PR
• The mean and var are estimated by sampling. There are other numerical method that could be a better idea. Also deferred to another PR.

• Code style is correct (follows pylint and black guidelines)
• Includes new or updated tests to cover the new feature
• New features are properly documented (with an example if appropriate)

[codecov-commenter]

Codecov Report

Merging #206 (2086247) into main (a209e3a) will decrease coverage by 0.06%.
The diff coverage is 90.00%.

@@            Coverage Diff             @@
##             main     #206      +/-   ##
==========================================
- Coverage   83.42%   83.37%   -0.06%     
==========================================
  Files          26       26              
  Lines        2872     2941      +69     
==========================================
+ Hits         2396     2452      +56     
- Misses        476      489      +13     

Impacted Files	Coverage Δ
preliz/distributions/__init__.py	100.00% <ø> (ø)
preliz/tests/test_maxent.py	100.00% <ø> (ø)
preliz/tests/test_mle.py	100.00% <ø> (ø)
preliz/tests/test_quartile.py	100.00% <ø> (ø)
preliz/distributions/continuous.py	92.90% <89.70%> (-0.20%)	⬇️
preliz/internal/distribution_helper.py	95.65% <100.00%> (+0.09%)	⬆️
preliz/tests/test_distributions.py	100.00% <100.00%> (ø)
preliz/distributions/discrete.py	92.28% <0.00%> (-1.86%)	⬇️

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