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Fix the performance issue caused by object contour detection logic using VNDetectContoursRequest #166

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@himanshunaidu

Additional context given here:
#163

One may want to use a Metal function to perform contour detection. Algorithm includes shrinking a given image by 1 pixel on all sides and then subtracting from the original image to get the contour lines.
NOTE: Need to know how to efficiently post-process the resultant image to get individual contours.

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