lms

Implement SST scheme #284

Job	Run time
check-for-todos	4s
msrv	4m 58s
rustfmt	12s
clippy	24s
set-msrv	4s
build (1.63, thumbv7em-none-eabi)	2m 53s
cross (1.63, aarch64-unknown-linux-gnu, default)	7m 27s
build (1.63, wasm32-unknown-unknown)	2m 56s
cross (stable, aarch64-unknown-linux-gnu, default)	4m 20s
bench	46s
test (1.63)	4m 23s
build (stable, thumbv7em-none-eabi)	17s
test (stable)	1m 34s
build (stable, wasm32-unknown-unknown)	19s
	30m 37s

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