More flexible type for BudgetOptimizer

[ricardoV94]

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--1429.org.readthedocs.build/en/1429/

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.63%. Comparing base (9994ee9) to head (bb358c8).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1429      +/-   ##
==========================================
+ Coverage   94.55%   94.63%   +0.07%     
==========================================
  Files          50       50              
  Lines        5416     5422       +6     
==========================================
+ Hits         5121     5131      +10     
+ Misses        295      291       -4     

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