[Feature] Some improvements to VecNorm #10485

Job	Run time
build-wheel-windows (3.8, 3.8)	2m 18s
build-wheel-linux (3.8, cp38-cp38, --index-url https://download.pytorch.org/whl/cpu, "['cpu', '11...	1m 37s
build-wheel-windows (3.9, 3.9)	2m 52s
build-wheel-linux (3.9, cp39-cp39, --index-url https://download.pytorch.org/whl/cpu, "['cpu', '11...	1m 37s
build-wheel-windows (3.10, 3.10.3)	2m 34s
build-wheel-linux (3.10, cp310-cp310, --index-url https://download.pytorch.org/whl/cpu, "['cpu', ...	1m 39s
build-wheel-windows (3.11, 3.11)	2m 8s
build-wheel-linux (3.11, cp311-cp311, --index-url https://download.pytorch.org/whl/cpu, "['cpu', ...	1m 38s
test-wheel (linux, ubuntu-20.04, 3.8)	2m 5s
test-wheel (linux, ubuntu-20.04, 3.9)	2m 18s
test-wheel (linux, ubuntu-20.04, 3.10)	2m 11s
test-wheel (linux, ubuntu-20.04, 3.11)	2m 54s
test-wheel-windows (3.8)	4m 35s
test-wheel-windows (3.9)	3m 57s
test-wheel-windows (3.10)	5m 40s
test-wheel-windows (3.11)	5m 40s
	45m 43s

Provide feedback