feat(enhanced-vision): implement BilateralFilter kernel #147

Job	Run time
build	1m 41s
Build rustVX (main)	1m 24s
Build Khronos OpenVX sample	1m 13s
image-ops	10s
vision-color	15s
graph	10s
KHR extension: user-data-object	11s
baseline	8s
vision-arithmetic	24s
vision-features	18s
vision-geometric	32s
data-objects	9s
vision-pyramid	10s
vision-filters	1m 3s
vision-statistics	10s
Perf gate (PR vs main)	2m 11s
enhanced-vision (106/106 passing)	55s
Benchmark & compare (rustVX vs Khronos sample)	4m 35s
	15m 39s

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