Add new APIs to communicate with one another about the predefined sound behavior...

Add new APIs to communicate with one another about the predefined sound behavior and to get acquired focus in system

 - New enumeration for sound behavior (SOUND_BEHAVIOR_NONE, SOUND_BEHAVIOR_NO_RESUME, SOUND_BEHAVIOR_FADING)
 - sound_manager_focus_set[get]_requesting_behavior() which is to set/get the requesting sound behavior before calling acquiring/releasing stream focus.
 - sound_manager_focus_get_requested_behavior() which is to get the requested sound behavior within sound_stream_focus_state_changed_cb().
 - Move internal APIs for getting focus status in the system to public header.
   : sound_manager_get_current_playback_focus()
   : sound_manager_get_current_recording_focus()

[Version] Release 0.3.65
[Profile] Common
[Issue Type] Feature Enhancement

Change-Id: I90421f80325a8d79d14495ee981283693dba009a
Signed-off-by: Sangchul Lee <sc11.lee@samsung.com>