[jit] Initial use RRef in TorchScript (#33190)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/33190
This enable the initial RRef type to be used inside TorchScript, user
could pass a python RRef into a torchscript function and call to_here
inside. Specifically, this PR:
- Add RRef schema type parsing
- Add python interop for RRef in Python and into JIT
- register to_here op in register_distributed_ops
More support for RRef in TorchScript will be added in future PRs
Test Plan: Imported from OSS
Differential Revision: D19871244
Pulled By: wanchaol
fbshipit-source-id: 7eca6c491a84666b261c70806254b705603bd663
