[c10d][jit] initial torchbind bindings for ProcessGroupNCCL (#42944)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/42944
Test Plan: Imported from OSS
Reviewed By: mrshenli
Differential Revision: D23228682
Pulled By: wanchaol
fbshipit-source-id: 30f4258ec2a90202264745511b897f4e1f5550f7
