feat: async serial #596

Job	Run time
mavlink-dump	54s
formatting	9s
linting	2m 20s
internal-tests (ardupilotmega)	1m 13s
msrv	38s
internal-tests (ardupilotmega, --features signing)	1m 11s
msrv (--features serde,tokio-1)	23s
internal-tests (asluav)	1m 24s
msrv (--features signing)	34s
internal-tests (asluav, --features signing)	1m 24s
internal-tests (matrixpilot)	1m 30s
internal-tests (matrixpilot, --features signing)	1m 36s
internal-tests (minimal)	1m 8s
internal-tests (minimal, --features signing)	1m 9s
internal-tests (paparazzi)	1m 14s
internal-tests (paparazzi, --features signing)	1m 19s
internal-tests (python_array_test)	1m 16s
internal-tests (python_array_test, --features signing)	1m 22s
internal-tests (slugs)	1m 5s
internal-tests (slugs, --features signing)	1m 12s
internal-tests (standard)	1m 12s
internal-tests (standard, --features signing)	1m 6s
internal-tests (test)	1m 10s
internal-tests (test, --features signing)	1m 10s
internal-tests (ualberta)	1m 18s
internal-tests (ualberta, --features signing)	1m 16s
internal-tests (uavionix)	1m 3s
internal-tests (uavionix, --features signing)	1m 5s
internal-tests (icarous)	1m 10s
internal-tests (icarous, --features signing)	1m 8s
internal-tests (common)	1m 5s
internal-tests (common, --features signing)	1m 4s
docs	16m 44s
build	0s
test-embedded-size	0s
	53m 32s

Provide feedback