extract out //c10/util:base library (#70854)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/70854
We can't do the entire package since parts of it depend on //c10/core.
ghstack-source-id: 147170901
Test Plan: Rely on CI.
Reviewed By: malfet
Differential Revision: D33321821
fbshipit-source-id: 6d634da872a382a60548e2eea37a0f9f93c6f080
(cherry picked from commit 0afa808367ff92b6011b61dcbb398a2a32e5e90d)
