NotificationListenerService API: Avoid unnecessary allocations

Instead of producing Ranking objects, RankingMap just populates
them now, allowing developers to re-use objects and avoid
unnecessary allocations.

Also rename isInterceptedByDnd() to meetsInterruptionFilter(),
since DND is not a concept anymore.

Bug: 15415840
Bug: 16099064
Change-Id: If9861cbdf14593e641a4d4ffd1b967647eb8e2b8
5 files changed