Add dict_to_array for logp_dlogp_function

[aseyboldt]

Depending on what your PR does, here are a few things you might want to address in the description:

• [ ] what are the (breaking) changes that this PR makes?
• [ ] important background, or details about the implementation
• [ ] are the changes—especially new features—covered by tests and docstrings?
• [ ] consider adding/updating relevant example notebooks
• [ ] right before it's ready to merge, mention the PR in the RELEASE-NOTES.md

[codecov[bot]]

Codecov Report

Merging #5925 (42800b8) into main (729f79c) will decrease coverage by 0.03%. The diff coverage is 82.22%.

@@            Coverage Diff             @@
##             main    #5925      +/-   ##
==========================================
- Coverage   89.52%   89.49%   -0.04%     
==========================================
  Files          73       73              
  Lines       13267    13295      +28     
==========================================
+ Hits        11877    11898      +21     
- Misses       1390     1397       +7     

Impacted Files	Coverage Δ
pymc/blocking.py	86.66% <79.41%> (-8.46%)	:arrow_down:
pymc/model.py	88.06% <90.00%> (+<0.01%)	:arrow_up:
pymc/parallel_sampling.py	85.80% <100.00%> (ø)

[michaelosthege]

What are all these changes about??

[ricardoV94]

@aseyboldt can you give more context to this PR? Are you still working on it or should we close it?

[ricardoV94]

@aseyboldt closing this as stale. Feel free to reopen if you are still working on it. It was not clear what the goal was