[WIP] wrap XLATensors into Python XLA wrapper class (#65841)
Summary:
**Improbably** fixes https://github.com/pytorch/pytorch/issues/65130
ezyang I'm super n00b in Python extensions, is this what we want to do?
Pull Request resolved: https://github.com/pytorch/pytorch/pull/65841
Reviewed By: navahgar
Differential Revision: D31889790
Pulled By: Krovatkin
fbshipit-source-id: c7f077b89f6f02df1962ab83d9e13fcc348a227d
