CustomMeasuredPowerCalculator

Adds a BatterySipper.customMeasuredPowerMah field to account
for custom energy buckets (i.e. EnergyConsumers of type OTHER)
and adds it to the total accumulated battery drain for each uid.

Bug: 179107328
Bug: 174818228
Test: Manual
Change-Id: Iab9c7ff5f410cd7c4be1ce78dfb2c39d4f783418