Rename dist_autograd_context and dist_autograd_container. (#29696)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/29696
The paths distributed/autograd/context/dist_autograd_context.h and
distributed/autograd/context/dist_autograd_container.h were repetitive.
Therefore renaming these to distributed/autograd/context/context.h and
distributed/autograd/context/container.h
ghstack-source-id: 93850266
Test Plan: waitforbuildbot
Differential Revision: D18467624
fbshipit-source-id: bbf3905396f553006851af296c880c1bd106ec47
