feat(proto): add go1.23 iterators over `ColMap` and `ColArr` #1293

Job	Run time
lint / gen	36s
lint / mod	6s
lint / run	44s
test / run (amd64, ubuntu-latest, 1.21.x)	45s
test / run (amd64, macos-latest, 1.21.x)	3m 38s
test / run (amd64, windows-latest, 1.21.x)	3m 15s
test / run (386, ubuntu-latest, 1.21.x)	44s
test / run (amd64, ubuntu-latest, -race, 1.21.x)	1m 3s
	10m 51s

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