[5/n] [torch/elastic] Introduce the delay utility function (#56533)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/56533
This PR introduces a small utility function to delay the execution of the current thread.
ghstack-source-id: 126979035
Test Plan: Run the associated unit tests.
Reviewed By: H-Huang
Differential Revision: D27889671
fbshipit-source-id: aae93b624bd4704da7a48004f50d130cec64969d
