Implement Queue

* Implement Queue which provides a flow control mechanism for data
  transmission between modules. This queue streaming data with
  EnqueueCallback and DequeueCallback based on the reactor pattern.
  Enqueue end should register callback when data is ready to be sent
  and unregister when no data ready to send. Dequeue end should
  register callback when ready to handle data and unregister when not
  ready to handle data.

* Implement ReactiveSemaphore, a wrapper for an event_fd work in
  non-blocking and Semaphore mode used by Queue to handle readable
  signal in the reactor pattern.

Test: run bluetooth_test_gd
Change-Id: Ia7019cdbe271d193c92f1a0b405ecced41a2d84b