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 lifts `globalThemeInfo` into the master reducer in `lib`. We also need to add `globalThemeInfo` to the web redux setup. (Had to do this in one diff to appease flow)
Part of https://linear.app/comm/issue/ENG-4956/lift-any-necessary-shared-types-selectors-functions-for-storing-the