Add NTPv5 support to `Peer` #34

Job	Run time
Audit dependencies	41s
Format	9s
Clippy (x86_64-unknown-linux-gnu, false, true)	20s
Build and test (stable, ubuntu-latest, x86_64-unknown-linux-gnu)	2m 50s
Clippy (armv7-unknown-linux-gnueabihf, true, false, -target arm-linux-gnueabihf -mcpu=generic+v7a...	25s
Build and test (beta, ubuntu-latest, x86_64-unknown-linux-gnu)	1m 26s
Clippy (x86_64-unknown-linux-musl, true, false, -target x86_64-linux-musl)	23s
Smoke-test fuzzing targets	5m 13s
Build and test (1.66.0, ubuntu-latest, x86_64-unknown-linux-gnu)	1m 41s
Clippy (x86_64-apple-darwin, true, false, -target x86_64-macos-gnu -g)	20s
Smoke-test fuzzing targets (--features ntpv5)	3m 26s
Build and test (stable, ubuntu-latest, x86_64-unknown-linux-musl)	2m 36s
Validate man pages	9s
Build and test (stable, macos-latest, x86_64-apple-darwin)	2m 4s
Check unused dependencies	1m 44s
Build and test (stable, ubuntu-latest, --features ntpv5, x86_64-unknown-linux-gnu)	3m 1s
Validate configs	54s
Build and test (1.66.0, ubuntu-latest, --features ntpv5, x86_64-unknown-linux-gnu)	1m 44s
Build and test (stable, ubuntu-latest, --features ntpv5, x86_64-unknown-linux-musl)	2m 37s
Build and test (stable, macos-latest, --features ntpv5, x86_64-apple-darwin)	1m 23s
	33m 6s

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