Budget optimizer refactor

[ricardoV94]

This PR refactors the budget optimizer to extract the response graph from the MMM model directly. The users don't have to pass the arguments needed to rebuild the response function, which simplifies things quite a lot and makes the optimizer able to handle arbitrarily complex models [citation needed]

Breaking changes:

1. Budget optimizer API totally changed. Only need to specify hmm_model, budget, and num_periods.
2. No more automatic summation of the response variable, and batch dims of chain/sample are not raveled (unless the idata already stacked them), so objective functions and constraints may need to be rewritten.

TODO:

• Tests of the BudgetOptimizer will need to be updated to have a hmm_model
• Update NBs (?)
• Update docs

Closes #1331

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📚 Documentation preview 📚: https://pymc-marketing--1357.org.readthedocs.build/en/1357/

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Codecov Report

Attention: Patch coverage is 19.51220% with 33 lines in your changes missing coverage. Please review.

Project coverage is 55.53%. Comparing base (7dfa955) to head (36985c4).

Files with missing lines	Patch %	Lines
pymc_marketing/mmm/budget_optimizer.py	20.51%	31 Missing ⚠️
pymc_marketing/mmm/mmm.py	0.00%	2 Missing ⚠️

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HEAD has 4 uploads less than BASE

Flag	BASE (7dfa955)	HEAD (36985c4)
	11	7

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #1357       +/-   ##
===========================================
- Coverage   95.31%   55.53%   -39.79%     
===========================================
  Files          47       47               
  Lines        4912     4921        +9     
===========================================
- Hits         4682     2733     -1949     
- Misses        230     2188     +1958     

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[juanitorduz]

yay! 🚀 Let me know if you need any support!

[ColtAllen]

Why does this have a CLV label?

[wd60622]

Why does this have a CLV label?

Seems like from file change bot. Then the force push made any clv files have no changes. I removed the clv label