Updates to NotificationMenuRowPlugin so that long press may be captured

This will allow the NotificationMenuRow plugin to do something else
rather than showing a menu when the view is long pressed.

- Allow menu to intercept touch events
- If the menu item provided to long press is null, don’t show it
- Also passes the status bar notification when the menu is created
  or updated

Bug: 62534409
Test: manual, have no plugin and long press -> see notification info
      have a plugin that returns null for long press -> nothing happens
Change-Id: I384c5217d5343e990f4c3506eb2477b015705e5c