backend/native: TD-T6 — real AVX2 kernels for scal/nrm2/asum (f32+f64) #416

Job	Run time
format/stable	21s
native-backend/stable	8m 18s
nostd/thumbv6m-none-eabi/stable	28s
hpc-stream-parallel/rayon	1m 20s
clippy/1.95.0	42s
tier4-avx512-check	27s
Pass MSRV values to other jobs	3s
docs/nightly	0s
nightly-simd-polyfill	0s
cross_test/${{ matrix.target }}/${{ matrix.rust }}	0s
cargo-careful	0s
miri	-1s
blas-msrv	49s
tests/beta	11m 20s
tests/1.95.0	11m 27s
tests/stable	10m 27s
conclusion	0s
	45m 41s

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