Add traits and types to capture dimensionality #585

Job	Run time
miri	42s
format/nightly	15s
docs/nightly	22s
cargo-careful	57s
clippy/stable	24s
nostd/thumbv6m-none-eabi/stable	17s
cross_test/i686-unknown-linux-gnu/stable	43s
cross_test/s390x-unknown-linux-gnu/stable	41s
Pass MSRV values to other jobs	3s
blas-msrv	32s
tests/beta	23s
tests/stable	18s
tests/1.64.0	20s
tests/nightly	27s
conclusion	-1s
	6m 23s

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