[normalizer] Pull Cache in its own module
[normalizer] Pull Cache in its own module

Summary: Simple refactor that cleans-up some code in the normalizer

Reviewed By: samwgoldman

Differential Revision: D19321548

fbshipit-source-id: 95f5946aecf341a3406898657284a497e8fae394

nmote/flow,nmote/flow,nmote/flow,nmote/flow,nmote/flow,nmote/flow,nmote/flow