Implement Pydantic V2 protocol
- [X] closes #53999
- [ ] [Tests added and passed](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#writing-tests) if fixing a bug or adding a new feature
- [ ] All [code checks passed](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#pre-commit).
- [x] Added [type annotations](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#type-hints) to new arguments/methods/functions.
- [ ] Added an entry in the latest `doc/source/whatsnew/vX.X.X.rst` file if fixing a bug or adding a new feature.

1. What's the best file to add a test for this change? 😅
2. Should I implement the one for `pd.DataFrame` as well on this PR?
thanks for your PR - could you show an example of how users would use this?

As in:
- how they can use this now
- how this PR changes/improves that

As for tests, maybe `test_downstream.py`? > If [#53999 (comment)](https://github.com/pandas-dev/pandas/issues/53999#issuecomment-1625289148) is true, then adding the pydantic protocol in pandas directly isn't a good idea if the protocol could differ on the use case

There was a miscommunication. This is what I meant: https://github.com/pandas-dev/pandas/issues/53999#issuecomment-1627346045  This pull request is stale because it has been open for thirty days with no activity. Please [update](https://pandas.pydata.org/pandas-docs/stable/development/contributing.html#updating-your-pull-request) and respond to this comment if you're still interested in working on this. closing as it looks like this is no longer active

but I'm interested in the idea - if explain it a bit more clearly, then am open to discussing this further It's active, and this is on my TODO list. 🤷‍♂️ 