move setup_helpers programs to their own package (#74838)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/74838
This matches structure of internal builds.
ghstack-source-id: 153272856
Test Plan: Should be a no-op, rely on CI to validate.
Reviewed By: ezyang
Differential Revision: D35187899
fbshipit-source-id: 44b51145df54c41836149704d0d84d4a882f158e
(cherry picked from commit af48ae5e7dd6ea7d6dc3acfb367d76508f7d6b0c)
