Organize & sort the KCP system

src/main/java/emu/grasscutter/server/game/session/GameSessionHandler.java

@@ -0,0 +1,31 @@
+package emu.grasscutter.server.game.session;
+
+import emu.grasscutter.net.KcpTunnel;
+import io.netty.buffer.Unpooled;
+import kcp.highway.Ukcp;
+import lombok.*;
+
+import java.net.InetSocketAddress;
+
+@RequiredArgsConstructor
+public final class GameSessionHandler implements KcpTunnel {
+    @Getter private final Ukcp handle;
+
+    @Override
+    public InetSocketAddress getAddress() {
+        return this.getHandle().user().getRemoteAddress();
+    }
+
+    @Override
+    public void writeData(byte[] bytes) {
+        var buffer = Unpooled.wrappedBuffer(bytes);
+        this.getHandle().write(buffer);
+
+        buffer.release();
+    }
+
+    @Override
+    public void close() {
+        this.getHandle().close();
+    }
+}