Add Censored distribution

[aloctavodia]

This adds a censored distribution, the moments are not implemented although there are general expressions for them. The same for the entropy. That will be implemented in another PR. Some test are included, but there is space to improve them.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 91.17647% with 9 lines in your changes are missing coverage. Please review.

Project coverage is 82.50%. Comparing base (4e9ae8e) to head (b2d3507).
Report is 1 commits behind head on main.

Files	Patch %	Lines
preliz/distributions/censored.py	85.00%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #372      +/-   ##
==========================================
+ Coverage   82.29%   82.50%   +0.20%     
==========================================
  Files          58       60       +2     
  Lines        5388     5486      +98     
==========================================
+ Hits         4434     4526      +92     
- Misses        954      960       +6     

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