Database restructure: use protobuf to save battery information fields.

This patch only updates the existing fields.
There will be 2 following patches to:
1. Expose the new fields (foreground / foreground service / background x
   usage time / power consumption) to UI.
2. Get the full charge cycle start time from Database and remove the
   SharedPreference.

Test: make RunSettingsRoboTests + manual
Bug: 253553141
Change-Id: Iee02dc7e671f97899cb1495323acfa0173e31df2