Experiment blas/sgemm usage instead of tract linalg MatMul #5982

Job	Run time
apple (aarch64-apple-ios)	1m 28s
linux (raspbian)	6m 33s
apple (aarch64-apple-darwin)	10m 40s
linux (aarch64-unknown-linux-gnu)	10m 45s
linux (aarch64-unknown-linux-gnu-stretch)	7m 30s
linux (armv6vfp-unknown-linux-gnueabihf)	9m 49s
linux (armv7-unknown-linux-gnueabihf)	9m 58s
linux (armv7-unknown-linux-gnueabihf-stretch)	7m 1s
linux (aarch64-unknown-linux-musl)	11m 25s
linux (armv7-unknown-linux-musl)	9m 48s
linux (aarch64-linux-android)	1m 28s
linux (armv7-linux-androideabi)	1m 31s
linux (i686-linux-android)	1m 15s
linux (x86_64-linux-android)	1m 35s
linux (wasm32-unknown-unknown)	38s
linux (wasm32-wasi)	43s
	1h 32m 7s

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