ci: add `typos` job (#644) #384

Job	Run time
minimal-versions / minimal-versions	30s
set-msrv / set-msrv	3s
build (1.81.0, thumbv7em-none-eabi)	17s
test (1.81.0)	27s
build (1.81.0, wasm32-unknown-unknown)	24s
test (stable)	24s
build (stable, thumbv7em-none-eabi)	12s
build (stable, wasm32-unknown-unknown)	12s
	2m 29s

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