Provide foreground_service usage time in BatteryDiffEntry.

- Fetch foreground service info through new api from UidBatteryConsumer.
- Record fgs & bg usage time separately, combine them till ui display.

Bug: 315255868
Test: make RunSettingsRoboTests ROBOTEST_FILTER="com.android.settings.fuelgauge.*"
Change-Id: Ic19844db7908a6ae6522c7a72972f44f94dcfca4
19 files changed