feat: Support Dataframes as Fields in Pydantic Models

[ytausch]

Closes #143.

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If this is released, the feedstock should add a version constraint on pydantic_core.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (fbecd10) to head (0a6007c).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #148   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           50        51    +1     
  Lines         2841      2896   +55     
=========================================
+ Hits          2841      2896   +55     

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[AndreasAlbertQC]

Thanks for the PR @ytausch!

I have no pre-existing experience with custom types in pydantic, so my review on that front relies on understanding the tests. Overall, I just have pretty minor comments.

[AndreasAlbertQC]

Thanks for the changes @ytausch, looks almost done to me! @borchero I think you also talked with @ytausch about this, so let me know if you still want to review as well

[ytausch]

side note: there are some CI checks not marked as required, is that intended?

[AndreasAlbertQC]

side note: there are some CI checks not marked as required, is that intended?

Nope, fixed, thanks for pointing it out :)

[AndreasAlbertQC]

LGTM now, thanks for bearing with all the fine-tuning :) I just checked in with @borchero and he asked to take a look before we merge, so let's please wait for his review.

[AndreasAlbertQC]

@borchero to avoid vacation-related hold-ups, we decided to mark this functionality as unstable and go ahead with the PR.