thermalservice: add ThermalService interfaces and thermalserviced

Binder interfaces IThermalService and IThermalEventListener are used
by frameworks native and Java code to publish and subscribe to
thermal events, and to detect thermal throttling status.

A following change adds HwBinder interfaces for vendor thermal
management code to send thermal events to this service.

Test: marlin
Bug: 30982366
Change-Id: I246ddd9b386e2388701b73fa0ecf9aff78ce0adb