customdist graphviz compatibility

[elc45]

Description

Adds a name to the dict arg of rv_op and adds a safe_shape_eval function when getting plates.

Related Issue

• Closes BUG: to_graphviz breaks when the model has a pm.CustomDist #8077

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

Type of change

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

[welcome]

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[elc45]

actually #8062 might fix this too. If so, feel free to close.

[codecov]

Codecov Report

❌ Patch coverage is 62.50000% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.86%. Comparing base (c868a84) to head (09ea8e1).

Files with missing lines	Patch %	Lines
pymc/model_graph.py	62.50%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8078      +/-   ##
==========================================
- Coverage   90.89%   90.86%   -0.03%     
==========================================
  Files         123      123              
  Lines       19489    19504      +15     
==========================================
+ Hits        17714    17723       +9     
- Misses       1775     1781       +6     

Files with missing lines	Coverage Δ
pymc/distributions/custom.py	95.52% <ø> (ø)
pymc/model_graph.py	83.38% <62.50%> (-1.16%)	⬇️

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