Improve the performance of AppDataUsagePreference

We only need aggregated summary, but NetworkCycleDataForUidLoader loads
usage for all cycles.

Create AppDataUsageSummaryRepository to reduce the system api call to
only once.

Fix: 304421722
Test: manual - on AppInfoSettings
Test: unit test
Change-Id: I115dfb51dbf77ed3fdde985aa1a968ff7462bebc