Split LauncherAppTransitionManagerImpl for Go

Split LauncherAppTransitionManagerImpl common functionality into a base
quickstep app transition class and subclass for recents-specific
implementation. In addition, override the app transition manager to the
appropriate manager depending on the build.

Bug: 114136250
Test: Manual test NexusLauncher, Launcher3GoWithQuickstep
Test: Build Launcher3GoIconRecents
Change-Id: Iab1b5ae0c75af276879d5e12df95f62a514bf571