md2

ci: add `typos` job (#644) #1062

Job	Run time
set-msrv / set-msrv	3s
minimal-versions / minimal-versions	47s
build (1.81.0, thumbv7em-none-eabi)	19s
test (1.81.0)	41s
build (1.81.0, wasm32-unknown-unknown)	19s
test (stable)	40s
build (stable, thumbv7em-none-eabi)	22s
build (stable, wasm32-unknown-unknown)	12s
	3m 23s

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