Add complex autograd support for `torch.cross` (#55854)
Summary:
Fixes https://github.com/pytorch/pytorch/issues/53512
Pull Request resolved: https://github.com/pytorch/pytorch/pull/55854
Reviewed By: nikithamalgifb
Differential Revision: D27737571
Pulled By: anjali411
fbshipit-source-id: 38165b952cc4c9213d61c7d98b549b984c154927
