Add plot of distributions

[NicolaCourtier]

Description

Add a plot for probability distributions that can be used to compare prior and posterior distributions for a Bayesian result.

Type of change

Please add a line in the relevant section of CHANGELOG.md to document the change (include PR #).

Important checks:

Please confirm the following before marking the PR as ready for review:

• No style issues: $ pre-commit run or $ nox -s pre-commit (see CONTRIBUTING.md for how to set this up to run automatically when committing locally, in just two lines of code)
• All tests pass: nox -s tests
• The documentation builds: nox -s doctest
• Code is commented for hard-to-understand areas
• Tests added that prove fix is effective or that feature works

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.69%. Comparing base (10aa794) to head (730e297).

Additional details and impacted files

@@                   Coverage Diff                   @@
##           add-plot-predictive     #927      +/-   ##
=======================================================
+ Coverage                92.63%   92.69%   +0.05%     
=======================================================
  Files                       74       75       +1     
  Lines                     5760     5791      +31     
=======================================================
+ Hits                      5336     5368      +32     
+ Misses                     424      423       -1     

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