Add more notification-y fields to the adapter

And update some callsites to handle the fact that the SBN might be null

Test: BundleEntryTest
Test: NotificationEntryTest
Test: SystemUI presubmit
Bug: 395857098
Flag: com.android.systemui.notification_bundle_ui
Change-Id: I17b908410997c9dd264e24fc3def3b6872614d28