[lib/native] lift theme types from native into lib

Summary:
Now that we want to bring updateThemeInfo redux actions/state into web as well there are several things we should lift from native into lib so that we can share them across both platforms. This diff handles lifting the releveant theme types into lib

Part of https://linear.app/comm/issue/ENG-4956/lift-any-necessary-shared-types-selectors-functions-for-storing-the

Test Plan: flow and confirmed that updating the app theme on native still works as expected

Reviewers: atul, rohan, inka

Reviewed By: atul

Subscribers: ashoat, tomek, ted, wyilio

Differential Revision: https://phab.comm.dev/D9528