Add new Volume Dialog dagger and coroutines infra

This change adds two new dagger subcomponents alongside the scoped
CoroutineScopes:
1) Plugin component which lives alongside the plugin initialization.
   This effectively is @Application scope now, because it will almost
never be destroyed. Having it separate will make the possible future work to attempl to move Volume Dialog to its own scope easier
2) Dialog component which lives with the Volume Dialog. This one is
   destroyed alongside the dialog itself and is more conservative in
terms of keeping stuff on a global scope. All UI work should happen here

Flag: com.android.systemui.volume_redesign
Test: passes presubmits
Bug: 369994090
Change-Id: Idab663549559c28c3954864ebc5c4ab50954d2d8