perf(morphology): optimize Dilate3x3 and Erode3x3 with direct slice a… #120

Job	Run time
build	2m 45s
Build Khronos OpenVX sample	48s
Build rustVX (main)	-1s
data-objects	12s
image-ops	12s
KHR extension: user-data-object	12s
vision-color	12s
baseline	9s
vision-features	17s
vision-filters	56s
vision-geometric	35s
vision-arithmetic	29s
vision-pyramid	10s
vision-statistics	14s
enhanced-vision (Phase 1 — Min/Max)	9s
graph	9s
Perf gate (PR vs main)	0s
Benchmark & compare (rustVX vs Khronos sample)	4m 43s
	12m 11s

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