Add notif ids to NotificationChannelClassification

Adds event_id, instance_id, and package_name to the
ClassificationChannelAdjustment atom.
This is to make this atom easier to import into Asterstats.

Bug: 375462619
Flag: android.service.notification.notification_classification
Test: atest NotificationManagerServiceTest
Change-Id: I4c2ce7bb48cd9ce57035bd887d4da9eb1eb537b6