Extend dataset_to_point_dict to accept both dataset and dict of dataarray

[OriolAbril]

Description

Extend dataset_to_point_list to accept both dataset (current behaviour) or a dictionary
of dataarrays. This will help with getting values from InferenceData into pymc functions
with even less overhead and conversions.

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

Type of change

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

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📚 Documentation preview 📚: https://pymc--7097.org.readthedocs.build/en/7097/

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (7bb2ccd) 92.21% compared to head (bedded8) 92.23%.
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7097      +/-   ##
==========================================
+ Coverage   92.21%   92.23%   +0.02%     
==========================================
  Files         101      101              
  Lines       16912    16883      -29     
==========================================
- Hits        15595    15572      -23     
+ Misses       1317     1311       -6     

Files	Coverage Δ
pymc/util.py	80.76% <100.00%> (+0.26%)	⬆️

... and 52 files with indirect coverage changes

[ricardoV94]

mypy is unhappy

[ricardoV94]

Thanks @OriolAbril !