implement dot for higher-dimensional arrays with Ix2 #673

Job	Run time
miri	9m 32s
cross_test/s390x-unknown-linux-gnu/stable	9m 18s
nostd/thumbv6m-none-eabi/stable	18s
clippy/stable	23s
Pass MSRV values to other jobs	2s
cargo-careful	1m 52s
format/nightly	15s
docs/nightly	21s
cross_test/i686-unknown-linux-gnu/stable	2m 11s
blas-msrv	38s
tests/stable	1m 58s
tests/beta	2m 35s
tests/1.87.0	2m 37s
tests/nightly	2m 45s
conclusion	-1s
	34m 44s

Provide feedback