feat: [#654] UDP tracker client: scrape

```console
$ cargo run --bin udp_tracker_client 127.0.0.1:6969 9c38422213e30bff212b30c360d26f9a02136422 | jq
   Compiling torrust-tracker v3.0.0-alpha.12-develop (/home/josecelano/Documents/git/committer/me/github/torrust/torrust-tracker)
    Finished dev [optimized + debuginfo] target(s) in 2.60s
     Running `target/debug/udp_tracker_client '127.0.0.1:6969' 9c38422213e30bff212b30c360d26f9a02136422`
{
  "announce_interval": 120,
  "leechers": 0,
  "peers": [],
  "seeders": 1,
  "transaction_id": -888840697
}
```

Author: josecelano

src/bin/udp_tracker_client.rs

@@ -1,13 +1,38 @@
+//! HTTP Tracker client:
+//!
+//! Examples:
+//!
+//! Announce request:
+//!
+//! ```text
+//! cargo run --bin udp_tracker_client 127.0.0.1:6969 9c38422213e30bff212b30c360d26f9a02136422 | jq
+//! ```
+//!
+//! Announce response:
+//!
+//! ```json
+//! {
+//!   "transaction_id": -888840697
+//!   "announce_interval": 120,
+//!   "leechers": 0,
+//!   "seeders": 1,
+//!   "peers": [
+//!     "123.123.123.123:51289"
+//!   ],
+//! }
+/// ````  
 use std::env;
 use std::net::{Ipv4Addr, SocketAddr};
 use std::str::FromStr;
 
 use aquatic_udp_protocol::common::InfoHash;
+use aquatic_udp_protocol::Response::{AnnounceIpv4, AnnounceIpv6};
 use aquatic_udp_protocol::{
     AnnounceEvent, AnnounceRequest, ConnectRequest, ConnectionId, NumberOfBytes, NumberOfPeers, PeerId, PeerKey, Port, Response,
     TransactionId,
 };
 use log::{debug, LevelFilter};
+use serde_json::json;
 use torrust_tracker::shared::bit_torrent::info_hash::InfoHash as TorrustInfoHash;
 use torrust_tracker::shared::bit_torrent::tracker::udp::client::{UdpClient, UdpTrackerClient};
 
@@ -52,7 +77,31 @@ async fn main() {
     )
     .await;
 
-    println!("{response:#?}");
+    match response {
+        AnnounceIpv4(announce) => {
+            let json = json!({
+                "transaction_id": announce.transaction_id.0,
+                "announce_interval": announce.announce_interval.0,
+                "leechers": announce.leechers.0,
+                "seeders": announce.seeders.0,
+                "peers": announce.peers.iter().map(|peer| format!("{}:{}", peer.ip_address, peer.port.0)).collect::<Vec<_>>(),
+            });
+            let pretty_json = serde_json::to_string_pretty(&json).unwrap();
+            println!("{pretty_json}");
+        }
+        AnnounceIpv6(announce) => {
+            let json = json!({
+                "transaction_id": announce.transaction_id.0,
+                "announce_interval": announce.announce_interval.0,
+                "leechers": announce.leechers.0,
+                "seeders": announce.seeders.0,
+                "peers6": announce.peers.iter().map(|peer| format!("{}:{}", peer.ip_address, peer.port.0)).collect::<Vec<_>>(),
+            });
+            let pretty_json = serde_json::to_string_pretty(&json).unwrap();
+            println!("{pretty_json}");
+        }
+        _ => println!("{response:#?}"),
+    }
 }
 
 fn setup_logging(level: LevelFilter) {