lms

Implement SST scheme #295

Job	Run time
rustfmt	14s
clippy	24s
check-for-todos	4s
msrv	3m 52s
set-msrv	3s
bench	48s
build (1.63, thumbv7em-none-eabi)	1m 40s
cross (1.63, aarch64-unknown-linux-gnu, default)	8m 22s
test (1.63)	3m 40s
build (1.63, wasm32-unknown-unknown)	1m 44s
cross (stable, aarch64-unknown-linux-gnu, default)	6m 38s
build (stable, thumbv7em-none-eabi)	18s
test (stable)	2m 10s
build (stable, wasm32-unknown-unknown)	20s
	30m 17s

Provide feedback