[package] resolve `__import__` calls on export (#55153)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/55153
Test Plan: Imported from OSS
Reviewed By: suo
Differential Revision: D27504536
Pulled By: Lilyjjo
fbshipit-source-id: 5e3e10f213c6e0cf1755d18eb19727515362f91a
