implement dot for higher-dimensional arrays with Ix2 #678

Job	Run time
cargo-careful	1m 50s
miri	8m 31s
nostd/thumbv6m-none-eabi/stable	18s
Pass MSRV values to other jobs	2s
cross_test/i686-unknown-linux-gnu/stable	2m 11s
docs/nightly	21s
clippy/stable	20s
cross_test/s390x-unknown-linux-gnu/stable	9m 1s
format/nightly	14s
blas-msrv	40s
tests/stable	2m 36s
tests/nightly	2m 59s
tests/1.87.0	2m 34s
tests/beta	2m 41s
conclusion	4s
	34m 22s

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