[JIT][torchbind] Namespaces for torchbind classes (#35054)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/35054
Test Plan: Imported from OSS
Differential Revision: D20541090
Pulled By: jamesr66a
fbshipit-source-id: ce3d9391dd3cdf619042b8f6ba2645f4c1fc875c
