Add graphviz method to ModelBuilder class

[ColtAllen]

Description

Moving graphviz method from MMM Base to ModelBuilder so that it's also supported in CLV moels.

Related Issue

• Closes graphviz method for ModelBuilder class #1138
• Related to #

Checklist

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

Modules affected

• MMM
• CLV

Type of change

• New feature / enhancement
• Bug fix
• Documentation
• Maintenance
• Other (please specify):

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📚 Documentation preview 📚: https://pymc-marketing--1284.org.readthedocs.build/en/1284/

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.05%. Comparing base (f749419) to head (a5d0cd5).
Report is 136 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1284      +/-   ##
==========================================
+ Coverage   95.03%   95.05%   +0.02%     
==========================================
  Files          42       42              
  Lines        4451     4451              
==========================================
+ Hits         4230     4231       +1     
+ Misses        221      220       -1     

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