Add examples and tests for combining static/class method with async execution (#40619) (#40688)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/40619
Test Plan: Imported from OSS
Differential Revision: D22258407
Pulled By: mrshenli
fbshipit-source-id: 036d85a2affc4505efd2df197fc513dba010e359
