k12: new implementation with parallel processing support (#839) #152

Job	Run time
set-msrv / set-msrv	6s
minimal-versions / minimal-versions	30s
build (1.85.0, thumbv7em-none-eabi)	19s
build (1.85.0, wasm32-unknown-unknown)	21s
build (stable, thumbv7em-none-eabi)	24s
build (stable, wasm32-unknown-unknown)	24s
test (1.85.0)	24s
test (stable)	24s
	2m 52s

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