extract out //c10/core:base library (#70857)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/70857
ghstack-source-id: 147302543
Test Plan: Relying on CI
Reviewed By: malfet
Differential Revision: D33329579
fbshipit-source-id: 961abdecabb7b2c6f090e00a6a670e5b70aa5bca
(cherry picked from commit 2b8c4bb0a4f6b22e028aa4cfbf06f09fb6873fa3)
