Add NTPv5 support to `Peer` #43

Job	Run time
Validate configs	1m 25s
Build and test (stable, ubuntu-latest, x86_64-unknown-linux-gnu)	50s
Audit dependencies	34s
Build and test (beta, ubuntu-latest, x86_64-unknown-linux-gnu)	1m 26s
Clippy (x86_64-unknown-linux-gnu, false, true)	1m 14s
Format	8s
Build and test (1.66.0, ubuntu-latest, x86_64-unknown-linux-gnu)	1m 20s
Clippy (armv7-unknown-linux-gnueabihf, true, false, -target arm-linux-gnueabihf -mcpu=generic+v7a...	54s
Build and test (stable, ubuntu-latest, x86_64-unknown-linux-musl)	1m 36s
Clippy (x86_64-unknown-linux-musl, true, false, -target x86_64-linux-musl)	36s
Smoke-test fuzzing targets	5m 2s
Validate man pages	9s
Build and test (stable, macos-latest, x86_64-apple-darwin)	1m 15s
Clippy (x86_64-apple-darwin, true, false, -target x86_64-macos-gnu -g)	44s
Smoke-test fuzzing targets (--features ntpv5)	2m 49s
Build and test (stable, ubuntu-latest, --features ntpv5, x86_64-unknown-linux-gnu)	1m 17s
Check unused dependencies	2m 0s
Build and test (1.66.0, ubuntu-latest, --features ntpv5, x86_64-unknown-linux-gnu)	1m 58s
Build and test (stable, ubuntu-latest, --features ntpv5, x86_64-unknown-linux-musl)	1m 36s
Build and test (stable, macos-latest, --features ntpv5, x86_64-apple-darwin)	1m 24s
	28m 17s

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