apps: cam: Print control direction information

Now that there is support for retrieving the allowed directions of a
control, print this information when listing controls.

Sample output:
$ cam --list-controls -c 2
Using camera Virtual0 as cam0
Control: [inout] draft::FaceDetectMode:
  - FaceDetectModeOff (0)
Control: [inout] libcamera::FrameDurationLimits: [16666..33333]
   Size: 2

Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

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