lms

Implement SST scheme #326

Job	Run time
rustfmt	10s
clippy	14s
msrv	2m 49s
check-for-todos	3s
set-msrv	4s
demo-lms (stable, default)	18s
cross (1.63, aarch64-unknown-linux-gnu, default)	7m 23s
build (1.63, thumbv7em-none-eabi)	47s
cross (stable, aarch64-unknown-linux-gnu, default)	6m 26s
bench	39s
build (1.63, wasm32-unknown-unknown)	50s
demo-sst (stable, default)	23s
build (stable, thumbv7em-none-eabi)	22s
build (stable, wasm32-unknown-unknown)	11s
test (1.63)	2m 50s
test (stable)	2m 4s
	25m 33s

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