[Feature] Some improvements to VecNorm #10487

Job	Run time
build-wheel-windows (3.8, 3.8)	2m 52s
build-wheel-linux (3.8, cp38-cp38, --index-url https://download.pytorch.org/whl/cpu, "['cpu', '11...	1m 29s
build-wheel-windows (3.9, 3.9)	3m 3s
build-wheel-linux (3.9, cp39-cp39, --index-url https://download.pytorch.org/whl/cpu, "['cpu', '11...	1m 34s
build-wheel-windows (3.10, 3.10.3)	3m 30s
build-wheel-windows (3.11, 3.11)	2m 53s
build-wheel-linux (3.10, cp310-cp310, --index-url https://download.pytorch.org/whl/cpu, "['cpu', ...	1m 45s
build-wheel-linux (3.11, cp311-cp311, --index-url https://download.pytorch.org/whl/cpu, "['cpu', ...	1m 34s
test-wheel (linux, ubuntu-20.04, 3.8)	2m 15s
test-wheel (linux, ubuntu-20.04, 3.9)	2m 23s
test-wheel (linux, ubuntu-20.04, 3.10)	2m 17s
test-wheel (linux, ubuntu-20.04, 3.11)	2m 48s
test-wheel-windows (3.8)	5m 25s
test-wheel-windows (3.9)	5m 8s
test-wheel-windows (3.10)	6m 12s
test-wheel-windows (3.11)	5m 8s
	50m 16s

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