libcamera: camera_sensor: Add support for embedded data

Some sensors support producing and transmitting embedded data over a
stream separate from the image stream. Add support for this feature in
the CameraSensor interface, and implement it for the CameraSensorRaw
class. The CameraSensorLegacy uses the default stub implementation, as
the corresponding kernel drivers don't support embedded data.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

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