[deploy] namespace and rename (#53670)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/53670
This puts deploy into the torch::deploy namespace. It also renames some
objects to better match their behavior:
PythonObject -> Obj, in the future it will refer to either a python object or a handle to a script obj, so rename it torch::deploy::Obj to be generic
MovableObject -> ReplicatedObj, to prevent confusion with "std::move" which is unrelated, and to note that we are replicating this object across interpreters.
Test Plan: Imported from OSS
Reviewed By: wconstab
Differential Revision: D26932131
Pulled By: zdevito
fbshipit-source-id: 8041d6c5b2041a7c3192c1a17d2edb38112a89f3
