Added (back) buffering to UDP's Read implementation #465

Job	Run time
formatting	21s
internal-tests (ardupilotmega)	1m 2s
mavlink-dump	1m 3s
internal-tests (asluav)	1m 25s
linting	1m 56s
msrv	3m 19s
internal-tests (matrixpilot)	1m 20s
internal-tests (minimal)	1m 12s
internal-tests (paparazzi)	1m 17s
internal-tests (python_array_test)	1m 33s
internal-tests (slugs)	1m 14s
internal-tests (standard)	1m 7s
internal-tests (test)	1m 1s
internal-tests (ualberta)	1m 28s
internal-tests (uavionix)	1m 6s
internal-tests (icarous)	1m 21s
internal-tests (common)	1m 0s
docs	1m 3s
build (macos-latest, x86_64-apple-darwin, --features ardupilotmega)	1m 27s
build (ubuntu-latest, arm-unknown-linux-musleabihf, --features ardupilotmega)	2m 4s
build (ubuntu-latest, armv7-unknown-linux-musleabihf, --features ardupilotmega)	2m 3s
build (ubuntu-latest, x86_64-unknown-linux-musl, --features ardupilotmega)	2m 8s
build (ubuntu-latest, x86_64-unknown-linux-musl, --features ardupilotmega,emit-description,emit-e...	2m 17s
build (ubuntu-latest, thumbv7m-none-eabi, --no-default-features --features embedded)	1m 10s
build (windows-latest, x86_64-pc-windows-msvc, --features ardupilotmega)	2m 55s
test-embedded-size	57s
	38m 49s

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