Rename `Typed/UntypedStorage` to `_Typed/_UntypedStorage` (#72540)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/72540
Reviewed By: jbschlosser
Differential Revision: D34216823
Pulled By: bdhirsh
fbshipit-source-id: 1bc9930ab582771ebf02308e035576cd1a0dbe47
(cherry picked from commit 329238f612a9d92586bb0e5b33bcc45a0ec6936b)