refactor: add a trait to describe shapes #663

Job	Run time
clippy/stable	25s
cargo-careful	2m 3s
miri	10m 11s
cross_test/s390x-unknown-linux-gnu/stable	7m 34s
docs/nightly	23s
format/nightly	16s
cross_test/i686-unknown-linux-gnu/stable	2m 13s
Pass MSRV values to other jobs	2s
nostd/thumbv6m-none-eabi/stable	20s
blas-msrv	48s
tests/stable	2m 27s
tests/nightly	2m 26s
tests/beta	2m 26s
tests/1.64.0	2m 11s
conclusion	0s
	33m 45s

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