Multidimensional support in plot_sensitivity_analysis

[PabloRoque]

Description

MMMPlotSuite.plot_sensitivity_analysis handles multidimensional MMMs

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--1886.org.readthedocs.build/en/1886/

[codecov]

Codecov Report

❌ Patch coverage is 0% with 94 lines in your changes missing coverage. Please review.
✅ Project coverage is 70.73%. Comparing base (63cdc8a) to head (9eb2366).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
pymc_marketing/mmm/plot.py	0.00%	94 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #1886       +/-   ##
===========================================
- Coverage   91.89%   70.73%   -21.16%     
===========================================
  Files          64       64               
  Lines        7572     7624       +52     
===========================================
- Hits         6958     5393     -1565     
- Misses        614     2231     +1617     

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[juanitorduz]

Thanks @PabloRoque ! Can we add some tests :) ?