REGR: Fix comparison broadcasting over array of Intervals
- [x] closes https://github.com/pandas-dev/pandas/issues/35931
- [x] tests added / passed
- [x] passes `black pandas`
- [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [x] whatsnew entry

Looks like `Interval.__richcmp__` returns `NotImplemented` in nearly all cases.  I think if we handle `util.is_array(other)` cases directly that might solve this problem without breaking addition > Looks like `Interval.__richcmp__` returns `NotImplemented` in nearly all cases. I think if we handle `util.is_array(other)` cases directly that might solve this problem without breaking addition

Nice, I think that's working. So far I only did a minimal copy / paste from another Cython class and stuff is passing, but am I missing some cases you can think of? LGTM thanks @dsaxton very nice! @meeseeksdev backport 1.1.x