power/stats: Add EnergyConsumer types

Also cleaning up Power Stats HAL type names to be less verbose

Bug: 176117316
Test: atest VtsHalPowerStatsTargetTest
Change-Id: I252a13b0490326ab9557f4a81ee313e57eb36754
Merged-In: I252a13b0490326ab9557f4a81ee313e57eb36754
30 files changed