[BE] minor improvement to dist quantization (#66649)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/66649
some minor changes to dist quantization, mainly change the namespace and add some notes for future code dedup
ghstack-source-id: 141336191
Test Plan: wait for ci
Reviewed By: cbalioglu
Differential Revision: D31663043
fbshipit-source-id: 2f96b7346e9c90df5ab2536767f8301eb86a9c79
