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d7f51398 - Apply pep604 to `torch/_dynamo` (#175555)

Apply pep604 to `torch/_dynamo` (#175555) Summary: Since python>=3.10 is defined in the pyproject.toml, we can enable [pep604](https://peps.python.org/pep-0604/) (in python >=3.10) Why? 1) Fewer imports making code simpler 2) Standardization - prior to this change, we could have `Optional` or the `| None` intermixed in the codebase 3) Future proof for direction of python type system X-link: https://github.com/pytorch/pytorch/pull/175555 Approved by: https://github.com/aorenste, https://github.com/zou3519 Reviewed By: jeanschmidt Differential Revision: D94811748 fbshipit-source-id: ca8ca84d7872b78f3d27e60d7fb8402eeb5c6c54