Listen to the notification posted events from NotificationListenerService instead

UsageStats NOTIFICATION_INTERRUPTION events are only created if a
conversation has its own conversation-specific notification channel
created. Switch to NotificationListenerService so that we could get the notification posted events from all conversations.

Bug: 146522621
Test: atest com.android.server.people.data.DataManagerTest
Test: atest com.android.server.people.data.UsageStatsQueryHelperTest
Change-Id: Iaa120567891144a952707deb5cea1321aa28341c