[Fast Pair] Add FastpairNotificationManager logic for subsequent pairing

e2e video: https://photos.app.goo.gl/WawkcRm9eND3HfBb7

Test: -m
Fix: 247152236
Ignore-AOSP-First: nearby_not_in_aosp_yet
Change-Id: If2913e5072f130425315d203eb7eb03236968a68
11 files changed