Fix example compile errors and clippy lints

bevy_matchbox/examples/hello_host.rs

@@ -60,22 +60,22 @@ fn start_host_socket(mut commands: Commands) {
     commands.insert_resource(socket);
 }
 
-fn send_message(mut socket: ResMut<MatchboxSocket<SingleChannel>>) {
+fn send_message(mut socket: ResMut<MatchboxSocket>) {
     let peers: Vec<_> = socket.connected_peers().collect();
 
     for peer in peers {
         let message = "Hello, I'm the host";
         info!("Sending message: {message:?} to {peer}");
-        socket.send(message.as_bytes().into(), peer);
+        socket.channel_mut(0).send(message.as_bytes().into(), peer);
     }
 }
 
-fn receive_messages(mut socket: ResMut<MatchboxSocket<SingleChannel>>) {
+fn receive_messages(mut socket: ResMut<MatchboxSocket>) {
     for (peer, state) in socket.update_peers() {
         info!("{peer}: {state:?}");
     }
 
-    for (_id, message) in socket.receive() {
+    for (_id, message) in socket.channel_mut(0).receive() {
         match std::str::from_utf8(&message) {
             Ok(message) => info!("Received message: {message:?}"),
             Err(e) => error!("Failed to convert message to string: {e}"),

matchbox_socket/src/webrtc_socket/native.rs

@@ -4,7 +4,7 @@ use crate::{
         error::SignalingError,
         messages::PeerSignal,
         signal_peer::SignalPeer,
-        socket::{create_data_channels_ready_fut, new_senders_and_receivers},
+        socket::create_data_channels_ready_fut,
         ChannelConfig, Messenger, Packet, Signaller,
     },
     RtcIceServerConfig,
@@ -314,6 +314,14 @@ impl Messenger for NativeMessenger {
     }
 }
 
+fn new_senders_and_receivers<T>(
+    channel_configs: &[ChannelConfig],
+) -> (Vec<UnboundedSender<T>>, Vec<UnboundedReceiver<T>>) {
+    (0..channel_configs.len())
+        .map(|_| futures_channel::mpsc::unbounded())
+        .unzip()
+}
+
 async fn complete_handshake(
     trickle: Arc<CandidateTrickle>,
     connection: &Arc<RTCPeerConnection>,

matchbox_socket/src/webrtc_socket/socket.rs

@@ -583,14 +583,6 @@ impl WebRtcSocket {
     }
 }
 
-pub(crate) fn new_senders_and_receivers<T>(
-    channel_configs: &[ChannelConfig],
-) -> (Vec<UnboundedSender<T>>, Vec<UnboundedReceiver<T>>) {
-    (0..channel_configs.len())
-        .map(|_| futures_channel::mpsc::unbounded())
-        .unzip()
-}
-
 pub(crate) fn create_data_channels_ready_fut(
     channel_configs: &[ChannelConfig],
 ) -> (