lms

Implement SST scheme #256

Job	Run time
msrv	5m 18s
clippy	32s
check-for-todos	3s
rustfmt	10s
set-msrv	3s
bench	39s
test (1.63)	4m 19s
cross (1.63, aarch64-unknown-linux-gnu, default)	8m 25s
build (1.63, thumbv7em-none-eabi)	2m 53s
test (stable)	1m 24s
cross (stable, aarch64-unknown-linux-gnu, default)	4m 26s
build (1.63, wasm32-unknown-unknown)	2m 53s
build (stable, thumbv7em-none-eabi)	13s
build (stable, wasm32-unknown-unknown)	37s
	31m 55s

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