feat(hpc): WHT polyfill, i2 quantization, pub kmeans #175

Job	Run time
format/stable	29s
cross_test/i686-unknown-linux-gnu/stable	1m 50s
nostd/thumbv6m-none-eabi/stable	35s
cross_test/s390x-unknown-linux-gnu/stable	1m 48s
native-backend/stable	48s
Pass MSRV values to other jobs	2s
clippy/stable	28s
docs/nightly	-1s
miri	-1s
cargo-careful	-1s
tests/1.64.0	58s
tests/beta	56s
blas-msrv	1m 1s
tests/stable	59s
conclusion	0s
	9m 51s

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