feat(enhanced-vision): implement vxMin/vxMax (Phase 1) #70

Job	Run time
Build Khronos OpenVX sample	55s
build	1m 51s
baseline	7s
vision-geometric	36s
vision-features	23s
vision-filters	1m 2s
vision-color	11s
data-objects	12s
vision-statistics	15s
vision-arithmetic	29s
enhanced-vision (Phase 1 — Min/Max)	13s
vision-pyramid	13s
graph	8s
image-ops	10s
Benchmark & compare (rustVX vs Khronos sample)	1m 25s
	8m 10s

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