lms

Implement SST scheme #317

Job	Run time
msrv	3m 57s
check-for-todos	2s
rustfmt	10s
clippy	15s
set-msrv	4s
bench	46s
build (1.63, thumbv7em-none-eabi)	1m 51s
cross (1.63, aarch64-unknown-linux-gnu, default)	8m 33s
build (1.63, wasm32-unknown-unknown)	1m 55s
demo-lms (stable, default)	38s
cross (stable, aarch64-unknown-linux-gnu, default)	6m 27s
build (stable, thumbv7em-none-eabi)	15s
demo-sst (stable, default)	28s
build (stable, wasm32-unknown-unknown)	20s
test (1.63)	3m 54s
test (stable)	2m 12s
	31m 47s

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