Use average coordinate of merged keypoints during NMS #2206

Job	Run time
Benchmark (sift, door-12, 15, JPG, test_data, olsson-loader, 1296, true)	7m 6s
Benchmark (lightglue, door-12, 15, JPG, test_data, olsson-loader, 1296, true)	10m 36s
Benchmark (sift, skydio-8, 15, jpg, gdrive, colmap-loader, 760, true)	3m 25s
Benchmark (lightglue, skydio-8, 15, jpg, gdrive, colmap-loader, 760, true)	3m 57s
Benchmark (sift, skydio-32, 15, jpg, gdrive, colmap-loader, 760, true)	5m 5s
Benchmark (lightglue, skydio-32, 15, jpg, gdrive, colmap-loader, 760, true)	7m 49s
Benchmark (sift, palace-fine-arts-281, 15, jpg, wget, olsson-loader, 320, true)	35m 9s
Benchmark (lightglue, notre-dame-20, 15, jpg, gdrive, colmap-loader, 760, false)	5m 56s
Benchmark (sift, 2011205_rc3, 15, png, wget, astrovision, 1024, true)	21m 35s
Benchmark (lightglue, 2011205_rc3, 15, png, wget, astrovision, 1024, true)	19m 35s
Benchmark (sift, gerrard-hall-100, 15, jpg, wget, colmap-loader, 760, true)	46m 45s
Benchmark (lightglue, gerrard-hall-100, 15, jpg, wget, colmap-loader, 760, true)	6h 0m 16s
Benchmark (sift, south-building-128, 15, jpg, wget, colmap-loader, 760, true)	1h 23m 3s
Benchmark (lightglue, south-building-128, 15, jpg, wget, colmap-loader, 760, true)	35m 0s
	10h 45m 17s

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