Break ModelBuilder into smaller classes

[williambdean]

Description

Splitting the original ModelBuilder into base class which then supports ModelBuilder and RegressionModelBuilder

Work in progress. Likely very broken at the moment

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--1467.org.readthedocs.build/en/1467/

[codecov]

Codecov Report

Attention: Patch coverage is 77.77778% with 30 lines in your changes missing coverage. Please review.

Project coverage is 74.04%. Comparing base (0eb7841) to head (e9f6f5c).

Files with missing lines	Patch %	Lines
pymc_marketing/model_builder.py	78.12%	28 Missing ⚠️
pymc_marketing/clv/models/basic.py	33.33%	2 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (0eb7841) and HEAD (e9f6f5c). Click for more details.

HEAD has 5 uploads less than BASE

Flag	BASE (0eb7841)	HEAD (e9f6f5c)
	11	6

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #1467       +/-   ##
===========================================
- Coverage   94.68%   74.04%   -20.65%     
===========================================
  Files          50       50               
  Lines        5457     5482       +25     
===========================================
- Hits         5167     4059     -1108     
- Misses        290     1423     +1133     

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[ColtAllen]

#1356 should be considered for the load method replacing this.