aquatic_http: add criterion benchmark for announce response to bytes

Speedup of custom implementation compared to using bendy:

announce-response-to-bytes:

time:   [413.77 ns 415.34 ns 417.08 ns]
change: [-93.074% -93.021% -92.968%] (p = 0.00 < 0.01)
Performance has improved.

aquatic_http/benches/bench_announce_response_to_bytes.rs

@@ -0,0 +1,42 @@
+use std::net::Ipv4Addr;
+use std::time::Duration;
+
+use criterion::{black_box, criterion_group, criterion_main, Criterion};
+
+use aquatic_http::protocol::response::*;
+
+
+pub fn bench(c: &mut Criterion) {
+    let mut peers = Vec::new();
+
+    for i in 0..100 {
+        peers.push(ResponsePeer {
+            ip_address: Ipv4Addr::new(127, 0, 0, i),
+            port: i as u16
+        })
+    }
+
+    let announce_response = AnnounceResponse {
+        announce_interval: 120,
+        complete: 100,
+        incomplete: 500,
+        peers: ResponsePeerListV4(peers),
+        peers6: ResponsePeerListV6(Vec::new()),
+    };
+
+    let response = Response::Announce(announce_response);
+
+    c.bench_function("announce-response-to-bytes", |b| b.iter(||
+        Response::to_bytes(black_box(&response))
+    ));
+}
+
+criterion_group!{
+    name = benches;
+    config = Criterion::default()
+        .sample_size(1000)
+        .measurement_time(Duration::from_secs(180))
+        .significance_level(0.01);
+    targets = bench
+}
+criterion_main!(benches);