Organize & sort the KCP system

src/main/java/emu/grasscutter/net/KcpChannel.java

@@ -0,0 +1,22 @@
+package emu.grasscutter.net;
+
+public interface KcpChannel {
+    /**
+     * Event fired when the client connects.
+     *
+     * @param tunnel The tunnel.
+     */
+    void onConnected(KcpTunnel tunnel);
+
+    /**
+     * Event fired when the client disconnects.
+     */
+    void onDisconnected();
+
+    /**
+     * Event fired when data is received from the client.
+     *
+     * @param bytes The data received.
+     */
+    void onMessage(byte[] bytes);
+}