* Preference below the modes list.
* Temporarily triggers addition of a mode with default name and type=SCHEDULE_TIME (type will be "manual only" later).
* Fixed sorting of modes in the list when refreshing (new modes were added at the bottom instead of where they should, the same would've happened for renamed modes).
* Minor polishes (extracted fragment launch to helper class, renamed item controller class for clarity).
Test: atest com.android.settings.notification.modes
Bug: 326442408
Fixes: 347198709
Flag: android.app.modes_ui
Change-Id: Ie276c92181c5374faf74592433595e7e15a5efc0
The new modes page has essentially no content yet, but this is a rough proof of concept for the existing abstract classes and hopefully serves as a building block for future changes. It lists modes and those preferences lead to contentless pages that will be fleshed out later..
Flag: android.app.modes_ui
Bug: 327260745
Test: ZenModePreferenceControllerTest
Test: manual; individual pages only have skeleton functionality and should be unit tested in future CLs
Change-Id: I12f48b48f761e3c9ff1a173445b15f7536d34edb
