fix: add MavFrame deser & ser warning, fixes #250 #503

Job	Run time
formatting	3s
internal-tests (ardupilotmega)	1m 5s
mavlink-dump	57s
internal-tests (asluav)	1m 15s
linting	1m 35s
internal-tests (matrixpilot)	1m 23s
internal-tests (minimal)	1m 4s
msrv	4m 27s
internal-tests (paparazzi)	1m 17s
internal-tests (python_array_test)	1m 30s
internal-tests (slugs)	1m 6s
internal-tests (standard)	1m 13s
internal-tests (test)	2m 9s
internal-tests (ualberta)	1m 17s
internal-tests (uavionix)	1m 6s
internal-tests (icarous)	1m 5s
internal-tests (common)	1m 1s
docs	33s
build (macos-latest, x86_64-apple-darwin, --features ardupilotmega)	1m 45s
build (ubuntu-latest, arm-unknown-linux-musleabihf, --features ardupilotmega)	1m 58s
build (ubuntu-latest, armv7-unknown-linux-musleabihf, --features ardupilotmega)	1m 54s
build (ubuntu-latest, x86_64-unknown-linux-musl, --features ardupilotmega)	1m 59s
build (ubuntu-latest, x86_64-unknown-linux-musl, --features ardupilotmega,emit-description,emit-e...	2m 15s
build (ubuntu-latest, thumbv7m-none-eabi, --no-default-features --features embedded)	1m 8s
build (windows-latest, x86_64-pc-windows-msvc, --features ardupilotmega)	3m 0s
test-embedded-size	39s
	38m 44s

Provide feedback