bpo-45535: [Enum] include special dunders in dir() (GH-30677)

Include the `__dunders__` in `dir()` that make `Enum` special:

- `__contains__`
- `__getitem__`
- `__iter__`
- `__len__`
- `__members__`

Ethan Furman committed 4y ago

7c0914d35eaaab2f323260ba5fe8884732533888

Parent: 3852269

Committed by GitHub <noreply@github.com> on 1/18/2022, 11:13:13 PM