[FX] Move examples to pytorch/examples (#51686)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/51686
Test Plan: Imported from OSS
Reviewed By: jansel
Differential Revision: D26241146
Pulled By: jamesr66a
fbshipit-source-id: b9cda75997fb98afd0e59ea78074fd7bd26ecebf
