Add OpInfo for `nn.functional.cosine_similarity` (#62959)
Summary:
Please see https://github.com/facebookresearch/functorch/issues/78 and https://github.com/pytorch/pytorch/issues/54261.
Notes:
* Some redundant tests from `test_nn.py` have been removed. I'm unsure about precision checks if they can be removed as well.
* Broadcasting is also checked in the OpInfo for `cosine_similarity`.
cc: mruberry zou3519 Chillee
Pull Request resolved: https://github.com/pytorch/pytorch/pull/62959
Reviewed By: heitorschueroff
Differential Revision: D30520176
Pulled By: zou3519
fbshipit-source-id: 14e902eb4bcce875edab28a1669a2ea021052b9b
