feat(examples): add Wayland globals lister utility

Minimal example that connects to the Wayland compositor and prints
all advertised globals (interface name, ID, version).

examples/list_globals.rs

@@ -0,0 +1,26 @@
+use wayland_client::globals::registry_queue_init;
+use wayland_client::globals::GlobalListContents;
+use wayland_client::protocol::wl_registry::{Event, WlRegistry};
+use wayland_client::{Connection, Dispatch, QueueHandle};
+
+struct Ls;
+
+impl Dispatch<WlRegistry, GlobalListContents> for Ls {
+    fn event(
+        _state: &mut Self,
+        _registry: &WlRegistry,
+        _event: Event,
+        _data: &GlobalListContents,
+        _conn: &Connection,
+        _qhandle: &QueueHandle<Self>,
+    ) {
+    }
+}
+
+fn main() {
+    let conn = Connection::connect_to_env().unwrap();
+    let (globals, _queue) = registry_queue_init::<Ls>(&conn).unwrap();
+    for g in globals.contents().clone_list() {
+        println!("{}: {} v{}", g.name, g.interface, g.version);
+    }
+}