Add support for checking tensor containers in `torch.testing` (#55385)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/55385
This renames `assert_tensors_(equal|close)` to `_check_tensors_(equal|close)` and exposes two new functions: `assert_(equal|close)`. In addition to tensor pairs, the newly added functions also support the comparison of tensors in sequences or mappings. Otherwise their signature stays the same.
Test Plan: Imported from OSS
Reviewed By: albanD
Differential Revision: D27903805
Pulled By: mruberry
fbshipit-source-id: 719d19a1d26de8d14cb25846e3d22a6ac828c80a
