feat(hpc/reductions): SIMD-dispatched sum/mean/max/min/argmax/nrm2 (#… #223

Job	Run time
nostd/thumbv6m-none-eabi/stable	31s
cross_test/s390x-unknown-linux-gnu/stable	2m 13s
docs/nightly	51s
cargo-careful	34s
format/stable	31s
clippy/stable	46s
cross_test/i686-unknown-linux-gnu/stable	1m 55s
miri	28s
native-backend/stable	1m 18s
Pass MSRV values to other jobs	2s
blas-msrv	59s
tests/1.64.0	57s
tests/beta	1m 14s
tests/stable	1m 8s
conclusion	0s
	13m 27s

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