Log notification location and assistant-generated when smart reply sent

When logging that a smart reply was sent, now also log where the
notification (containing the reply) is shown, and whether the smart
reply was generated by the assistant (or provided by the application
itself).

Bug: 120767764
Test: click smart reply from notification shade and from heads-up to
ensure correct location is logged.
Test: click smart reply with system-generated replies vs. app-generated
replies to ensure we log generatedByAsssistant correctly.
Change-Id: I43e1f5a07732d578d7890a6f059432c6d6e5038c