Add blocking helper logging

The added logging events are: blocking helper view displayed or
dismissed, any button click within the view, undo clicks and
system suggests of blocking helper.

* Move some of the getLogMaker logic of server's NotificationRecord
  class to the common StatusBarNotification class.
* Use the StatusBarNotification.getLogMaker to produce blocking helper
  logging.
* Add logging in the NotificationInfo for interaction and display of
  the blocking helper view.
* Add logging in the NotificationBlockingHelperManager for system
  suggests of blocking helper.

Bug: 112482290
Test: unittests and manual - viewed produced logs.
Change-Id: I3a5267d55faba21f6668d35ff8aa12deb0dc5921