lms

Implement SST scheme #266

Job	Run time
rustfmt	12s
msrv	4m 59s
clippy	29s
check-for-todos	3s
set-msrv	4s
bench	42s
test (1.63)	4m 25s
build (1.63, thumbv7em-none-eabi)	2m 58s
test (stable)	1m 35s
cross (1.63, aarch64-unknown-linux-gnu, default)	7m 19s
build (1.63, wasm32-unknown-unknown)	2m 57s
cross (stable, aarch64-unknown-linux-gnu, default)	4m 20s
build (stable, thumbv7em-none-eabi)	18s
build (stable, wasm32-unknown-unknown)	24s
	30m 45s

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