Add new loader for network stats detail.

- create a new loader that will replace SummaryForAllUidLoaderCompat,
which uses the NetworkStatsManager.queryDetails() to retrieve the
network stats data, instead of using the NetworkStatsSession.

Bug: 111751694
Test: make RunSettingsRoboTests
Change-Id: If5f644e65335133b12da2c786f81d9ce60214c41