Update header to have content intent & settings buttons

* Sets notification entry on BubbleExpandedViewContainer and use that to
  to populate the contents
* Adds settings + app deeplink buttons to header
* Header will use bubble metadata text if it exists or the app name

Bug: 111236845
Test: manual - tested with notify activity view based bubble that
      (1) - tapping deep link button opens content intent
      (2) - tapping settings button opens notif settings for app
Change-Id: I07d6beced7da001e233237b91053b0fc4b18505b