Add Model.to_graphviz shortcut

[juanitorduz]

Closes #6794

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📚 Documentation preview 📚: https://pymc--6865.org.readthedocs.build/en/6865/

[codecov]

Codecov Report

Merging #6865 (e2b40db) into main (accabdf) will decrease coverage by 0.70%.
Report is 13 commits behind head on main.
The diff coverage is 93.75%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6865      +/-   ##
==========================================
- Coverage   92.03%   91.33%   -0.70%     
==========================================
  Files          96       96              
  Lines       16369    16448      +79     
==========================================
- Hits        15065    15023      -42     
- Misses       1304     1425     +121     

Files Changed	Coverage Δ
pymc/logprob/transforms.py	94.42% <90.90%> (-0.27%)	⬇️
pymc/distributions/multivariate.py	92.55% <100.00%> (+0.33%)	⬆️
pymc/model.py	90.92% <100.00%> (-0.10%)	⬇️
pymc/sampling/jax.py	98.30% <100.00%> (+0.04%)	⬆️

... and 4 files with indirect coverage changes

[michaelosthege]

I would prefer the to_graphviz prefix - not only to align with the original functions, but also to make it more discoverable with other (future) conversion methods. Thinking of to_networkx..

[twiecki]

We still need the string so that this shows up in the release notes.

[ricardoV94]

We still need the string so that this shows up in the release notes.

The PR title is all that's needed. Then the label determines in which section it shows up.

[Armavica]

I was using this today, I forgot how it worked and all the explanations assume that people use notebooks: would it make sense to add a return type (str) to the function, and explain somewhere that outside of a notebook, you would need to write this string to a file and call dot on it?

[ricardoV94]

I was using this today, I forgot how it worked and all the explanations assume that people use notebooks: would it make sense to add a return type (str) to the function, and explain somewhere that outside of a notebook, you would need to write this string to a file and call dot on it?

Do you mind opening an issue for that? I don't think it should block this issue