Add task schedule API to remote access HAL.

These APIs allows a client to schedule a task to be executed later.
If the vehicle is off when the task is to be exectued, the vehicle
will be woken up, execute the task and shutdown. If the vehicle is
already up, the task will be exectued.

Test: None
Bug: 282792374
Change-Id: I97c4fdbe2cba035e8bd9ddede4c94d0331c39eef