Experiment blas/sgemm usage instead of tract linalg MatMul #5979

Job	Run time
linux (raspbian)	6m 23s
linux (aarch64-unknown-linux-gnu)	11m 5s
linux (aarch64-unknown-linux-gnu-stretch)	6m 53s
linux (armv6vfp-unknown-linux-gnueabihf)	9m 34s
linux (armv7-unknown-linux-gnueabihf)	9m 36s
linux (armv7-unknown-linux-gnueabihf-stretch)	6m 56s
apple (aarch64-apple-ios)	1m 32s
linux (aarch64-unknown-linux-musl)	11m 25s
apple (aarch64-apple-darwin)	10m 44s
linux (armv7-unknown-linux-musl)	9m 35s
linux (aarch64-linux-android)	1m 21s
linux (armv7-linux-androideabi)	1m 24s
linux (i686-linux-android)	1m 34s
linux (x86_64-linux-android)	1m 8s
linux (wasm32-unknown-unknown)	32s
linux (wasm32-wasi)	31s
	1h 30m 13s

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