Add support for getting all available microphones characteristics.

Add MicrophoneInfo to represent the microphone characteristics which
including location, orientation, frequency response, sensitivity,
channel mapping and other useful information.
Add a new API in AudioManager to query all current available
microphones.

Bug: 64038649
Test: Run test and check the print log.
Change-Id: Ie0dbfeeb84b88db426518b93c7bb83c8913bca85