[refactor] move channel module into transport module

src/transport/packet_sender/packet_sender.h

@@ -0,0 +1,25 @@
+/*
+ * @Author: DI JUNKUN
+ * @Date: 2025-03-17
+ * Copyright (c) 2025 by DI JUNKUN, All Rights Reserved.
+ */
+
+#ifndef _PACKET_SENDER_H_
+#define _PACKET_SENDER_H_
+
+#include <memory>
+#include <vector>
+
+#include "rtp_packet.h"
+
+class PacketSender {
+ public:
+  PacketSender() {}
+  virtual ~PacketSender() {}
+
+  virtual int Send() = 0;
+  virtual int InsertRtpPacket(
+      std::vector<std::unique_ptr<RtpPacket>> &rtp_packets) = 0;
+};
+
+#endif