Add InstalledSamplers Pydantic class (#1398)

[elanale]

Description

Related Issue

• Closes #
• Related to #

Checklist

• Checked that the pre-commit linting/style checks pass. Feel free to comment pre-commit.ci autofix to auto-fix.
• Included tests that prove the fix is effective or that the new feature works
• Added necessary documentation (docstrings and/or example notebooks) using numpydoc format.
• If you are a pro: each commit corresponds to a relevant logical change

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📚 Documentation preview 📚: https://pymc-marketing--1747.org.readthedocs.build/en/1747/

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.60%. Comparing base (5dc5b2b) to head (ade6c39).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1747   +/-   ##
=======================================
  Coverage   91.59%   91.60%           
=======================================
  Files          60       60           
  Lines        6782     6788    +6     
=======================================
+ Hits         6212     6218    +6     
  Misses        570      570           

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[williambdean]

Thanks for the PR @elanale

[williambdean]

Can you fix the pre-commit errors. Feel free to use the comment to auto-fix (link in the PR body)

[williambdean]

How does this implementation work?

[juanitorduz]

@elanale Thank you for opening this PR. Could you please a description of this PR to have context on the desired change?