Add traits and types to capture dimensionality #587

Job	Run time
Pass MSRV values to other jobs	3s
docs/nightly	20s
miri	10m 53s
cross_test/i686-unknown-linux-gnu/stable	1m 55s
nostd/thumbv6m-none-eabi/stable	18s
format/nightly	16s
clippy/stable	16s
cross_test/s390x-unknown-linux-gnu/stable	9m 17s
cargo-careful	2m 2s
blas-msrv	54s
tests/stable	2m 21s
tests/beta	2m 22s
tests/nightly	3m 17s
tests/1.64.0	3m 27s
conclusion	4s
	37m 45s

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