ENH: .equals for Extension Arrays
- [x] closes #27081
- [x] tests added / passed
- [x] passes `black pandas`
- [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [ ] whatsnew entry

--- Jan 3 10:00 PST

Hey team,

Looking for a bit of feedback on this API design and appropriate testing for this PR before I get too deep into it. Could you provide some guidance regarding how to appropriately handle updating this test? https://github.com/pandas-dev/pandas/blob/6f03e76f9d47ecfcfdd44641de6df1fc7dd57a01/pandas/tests/extension/base/ops.py#L162 It appears to contradict the issue #27081.

Appreciate the help,
Dave
