Sensor event direct report mode support API

Add direct report mode support API with stub implementation.

 * new SensorDirectChannel class to represent direct channel and
   hold related constants.
 * new methods in SensorManager to create/destroy direct channel
 * new method in SensorManager to config sensor report in direct
   channel
 * new methods in Sensor to expose direct report related capability
   of sensor.

Test: tested with demo app
Bug: 30985702
Change-Id: Ic03c67bea4ed0a728d3d783e95de6c59cf663cca