Add Manage Windows option to Taskbar long press menu

This change adds an option to the long press menu on Taskbar apps to
view open instances of the calling apps. It will only show on apps that
support multi instance (ex. Chrome).

Bug: 315989246
Test: Manual
Flag: com.android.launcher3.enable_multi_instance_menu_taskbar
Change-Id: Ie1e001c4cec831c751bcbf448aaa68bb90fb24ca