Deprecate to/from_json of Prior class in favor of to/from_dict

[wd60622]

Description

The to/from_json methods are replaced with to/from_dict methods which has become a more standard method name.

They are a drop in replacement.

Related Issue

• Closes #
• 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
• Customer Choice

Type of change

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

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📚 Documentation preview 📚: https://pymc-marketing--1338.org.readthedocs.build/en/1338/

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[codecov]

Codecov Report

Attention: Patch coverage is 93.33333% with 2 lines in your changes missing coverage. Please review.

Project coverage is 95.34%. Comparing base (c989eeb) to head (acde887).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
pymc_marketing/mmm/hsgp.py	33.33%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1338   +/-   ##
=======================================
  Coverage   95.34%   95.34%           
=======================================
  Files          47       47           
  Lines        4963     4966    +3     
=======================================
+ Hits         4732     4735    +3     
  Misses        231      231           

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