BUG: Unary pos/neg ops on IntegerArrays failing with TypeError

[asishm]

• closes BUG: Unary minus raises for series with Int64Dtype #36063
• tests added / passed
• passes black pandas
• passes git diff upstream/master -u -- "*.py" | flake8 --diff
• whatsnew entry

[TomAugspurger]

What behavior do we want for unary minus on a uint array? Wrap around?

[asishm]

0 - uint_series currently wraps arround. probably makes sense to keep the unary neg to exhibit the same behavior.

Also I'm not sure if I wrote the tests correctly. I think I'd have to xfail test_neg and test_pos for BooleanArrays or move those methods over to test_integer.py specifically. thoughts?

[asishm]

there's a simpler fix here

by adding __neg__ and __pos__ implementations to BaseMaskedArray (__invert__ is already implemented) and changing the __neg__ implementation of BooleanArray to call __invert__

That passes the current tests that I added.

thoughts?
#36081 for implementation