feat(simd): add ndarray::simd::bf16_tile_gemm_16x16 polyfill primitive #575

Job	Run time
Pass MSRV values to other jobs	2s
tier4-avx512-check	28s
nostd/thumbv6m-none-eabi/stable	26s
hpc-stream-parallel/rayon	1m 29s
clippy/1.95.0	42s
format/stable	22s
native-backend/stable	7m 58s
cargo-careful	0s
cross_test/${{ matrix.target }}/${{ matrix.rust }}	0s
nightly-simd-polyfill	0s
docs/nightly	0s
miri	0s
blas-msrv	50s
tests/1.95.0	10m 54s
tests/beta	10m 49s
tests/stable	11m 38s
conclusion	-1s
	45m 37s

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