Implement native PacketDump capture (#87)

crates/libremetaverse/tests/network_manager.rs

@@ -183,6 +183,42 @@ fn packet_callbacks_preserve_filtering_order_async_policy_and_reentrancy() {
     );
 }
 
+#[test]
+fn decoded_packet_callbacks_preserve_optional_raw_datagrams() {
+    let client = GridClient::new().expect("client");
+    let sim = simulator(&client);
+    let events = PacketEventDictionary::new(client).expect("packet events");
+    let observed = Arc::new(Mutex::new(None));
+    let captured = Arc::clone(&observed);
+    events
+        .register_event(
+            PacketType::Default,
+            Arc::new(move |event| *captured.lock().unwrap() = event.raw_data()),
+            false,
+        )
+        .unwrap();
+    let raw = vec![0x40, 0, 0, 0, 0, 0, 1, 7, 0, 0, 0, 0];
+    events
+        .invoke_raise_event_with_raw_data(
+            PacketType::StartPingCheck,
+            base_packet(PacketType::StartPingCheck),
+            sim.clone(),
+            raw.clone(),
+        )
+        .unwrap();
+    assert_eq!(*observed.lock().unwrap(), Some(raw));
+
+    *observed.lock().unwrap() = Some(vec![1]);
+    events
+        .invoke_raise_event(
+            PacketType::StartPingCheck,
+            base_packet(PacketType::StartPingCheck),
+            sim,
+        )
+        .unwrap();
+    assert_eq!(*observed.lock().unwrap(), None);
+}
+
 #[test]
 fn synchronous_specific_dispatch_suppresses_default_async_chain_like_reference() {
     let mixed_events = PacketEventDictionary::new(GridClient::new().unwrap()).unwrap();