Add NTPv5 support to `Peer` #39

Job	Run time
Validate configs	56s
Build and test (stable, ubuntu-latest, x86_64-unknown-linux-gnu)	1m 50s
Audit dependencies	32s
Build and test (beta, ubuntu-latest, x86_64-unknown-linux-gnu)	3m 34s
Clippy (x86_64-unknown-linux-gnu, false, true)	2m 41s
Build and test (1.66.0, ubuntu-latest, x86_64-unknown-linux-gnu)	10m 4s
Format	10s
Clippy (armv7-unknown-linux-gnueabihf, true, false, -target arm-linux-gnueabihf -mcpu=generic+v7a...	40s
Build and test (stable, ubuntu-latest, x86_64-unknown-linux-musl)	1m 55s
Clippy (x86_64-unknown-linux-musl, true, false, -target x86_64-linux-musl)	48s
Smoke-test fuzzing targets	5m 33s
Build and test (stable, macos-latest, x86_64-apple-darwin)	2m 38s
Validate man pages	12s
Clippy (x86_64-apple-darwin, true, false, -target x86_64-macos-gnu -g)	47s
Smoke-test fuzzing targets (--features ntpv5)	3m 27s
Build and test (stable, ubuntu-latest, --features ntpv5, x86_64-unknown-linux-gnu)	1m 22s
Build and test (1.66.0, ubuntu-latest, --features ntpv5, x86_64-unknown-linux-gnu)	9m 47s
Build and test (stable, ubuntu-latest, --features ntpv5, x86_64-unknown-linux-musl)	4m 7s
Check unused dependencies	1m 50s
Build and test (stable, macos-latest, --features ntpv5, x86_64-apple-darwin)	1m 43s
	54m 36s

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