Add traits and types to capture dimensionality #595

Job	Run time
format/nightly	15s
cross_test/i686-unknown-linux-gnu/stable	1m 54s
cargo-careful	1m 45s
clippy/stable	19s
miri	10m 39s
nostd/thumbv6m-none-eabi/stable	12s
docs/nightly	21s
cross_test/s390x-unknown-linux-gnu/stable	9m 35s
Pass MSRV values to other jobs	2s
tests/nightly	2m 52s
tests/beta	2m 30s
blas-msrv	43s
tests/stable	2m 27s
tests/1.64.0	3m 24s
conclusion	2s
	37m 0s

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