Refactor TaskbarLauncherStateController to use a single AnimatedFLoat

- Use a single iconAlignment animation
- Introduced isInLauncher/goingToLauncher/FLAGS_LAUNCHER as combined FLAG_RESUMED|FLAG_RECENTS_ANIMATION_RUNNING
- iconAlignment is now centralized in onStateChangeApplied with single source of truth

Bug: 245320601
Test: Home<->Overview, Home<->App, App<->Overview, Home->Overview->App->Home, Home->App->Overview->Home, Overview->Home->App->Overview, Overview->App->Home->Overview, App->Overview->Home->App, App->Home->Overview->App
Test: Go to AllApps, call KEYCODE_HOME, go to app and taskbar should be there
Test: App->Overview->Select->Home->App
Test: QuickSwitch -> App
Test: Repeat above with taskbarStashed on/off
Test: Repeat above with gesture and 3-button
Change-Id: Ie51b602394c155aca060a84585eb0e677e23425c