lights: Add state to the example service

Add a Light struct to the example service so it can hold a HwLight and
its associated HwLightState. Also added a HashMap of ids -> Light to the
LightService and updated the HAL methods implementation to make the
service stateful.

Now instantiating a LightService requires that a list of HwLights is
provided, so a default implementation was provided as a convenience. The
android.hardware.light rust API version had to be bumped since we rely
on new derive statements added to the AIDL files.

Tested: built VtsHalLightTargetTest and ran in Cuttlefish
Bug: 286106270
Change-Id: Id2b17a6a2290295c7b0b5405ac9815eaa28303c6