Adds TestViewOps, updates documentation (#32512)
Summary:
Understanding which ops return views and which return tensors with new storage is a common user issue, and an issue for developers connecting accelerators to PyTorch, too. This generic test suite verifies that ops which should return views do (and a few ops that shouldn't don't). The documentation has also been updated for .t(), permute(), unfold(), and select() to clarify they return views.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/32512
Differential Revision: D19659454
Pulled By: mruberry
fbshipit-source-id: b4334be9b698253a979e1bb8746fdb3ca24aa4e3
