Create controller for Power HAL handles.

This controller is also a PowerHalWrapper and delegates each api call to
the Power HAL currently connected. It is also responsible for
reconnecting with it after any api call fails.

This cl also introduces PowerHalConnector, to abstract away the logic to
connect to a Power HAL.

Bug: 150878220
Test: atest powermanager_test
Change-Id: I24cd262ce40429cc1107a1f0184ed2719a7492d9