Add new interface for camera status and metadata

Add new interface for camera status and metadata

- enum
 : camera_status_auto_exposure_e
   CAMERA_STATUS_AUTO_EXPOSURE_NONE
   CAMERA_STATUS_AUTO_EXPOSURE_UNSTABLE
   CAMERA_STATUS_AUTO_EXPOSURE_STABLE
 : camera_status_auto_white_balance_e
   CAMERA_STATUS_AUTO_WHITE_BALANCE_NONE
   CAMERA_STATUS_AUTO_WHITE_BALANCE_UNSTABLE
   CAMERA_STATUS_AUTO_WHITE_BALANCE_STABLE
- structure
 : camera_metadata_s
   camera_status_auto_exposure_e status_ae;
   camera_status_auto_white_balance_e status_awb;

[Version] 0.0.21
[Issue Type] New feature

Change-Id: I1a3100edc96abcb89d631c13c996317564a19171
Signed-off-by: Jeongmo Yang <jm80.yang@samsung.com>