ENH: add Series.struct accessor for ArrowDtype[struct]
Features:

* Series.struct.dtypes -- see dtypes and field names
* Series.struct.field(name_or_index) -- extract a field as a Series
* Series.struct.to_frame() -- convert all fields into a DataFrame

- [x] closes #54938 (Replace xxxx with the GitHub issue number)
- [x] [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
- [x] 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.
- [x] Added an entry in the latest `doc/source/whatsnew/vX.X.X.rst` file if fixing a bug or adding a new feature.

Closes #54938 
@mroeschke Thanks for the feedback! I believe I've now addressed all of your comments. @mroeschke OK to merge now? Nice thanks @tswast 