[AudioManager] Add new APIs for USB Audio output device (#447)

[AudioManager] Add new APIs for USB Audio output device (#447)

* [AudioManager] Add new APIs regarding sample format and rate for USB audio output device

Added in AudioDevice class as below:
 - method
  : GetSupportedSampleFormats()
  : GetSupportedSampleRates()
 - member
  : SampleFormat
  : SampleRate

Signed-off-by: Sangchul Lee <sc11.lee@samsung.com>
* [AudioManager] Add new APIs regarding USB audio output device setting

'AvoidResampling' and 'MediaStreamOnly' properties are added in AudioDevice class

Signed-off-by: Sangchul Lee <sc11.lee@samsung.com>
* [AudioManager] Export methods instead of properties that can throw exceptions

Enumeration of AudioSampleFormat.cs is also revised.

Signed-off-by: Sangchul Lee <sc11.lee@samsung.com>
* [AudioManager] Convert rate enum value from core to uint and fix bug

Signed-off-by: Sangchul Lee <sc11.lee@samsung.com>
* [AudioManager] Fix documentation

Signed-off-by: Sangchul Lee <sc11.lee@samsung.com>