feat(monitor): 添加监控模块用于订阅和打印运动状态和里程计数据

添加新的Monitor类，用于订阅并打印SportModeState和Odometry消息数据
移除custom_robot.cpp中冗余的日志信息
更新CMakeLists.txt以包含新的监控模块

include/monitor.hpp

@@ -0,0 +1,28 @@
+#ifndef MONITOR_HPP
+#define MONITOR_HPP
+
+#include <unitree/idl/go2/SportModeState_.hpp>
+#include <unitree/idl/ros2/Odometry_.hpp>
+#include <unitree/robot/channel/channel_subscriber.hpp>
+#include <memory>
+
+namespace custom {
+
+class Monitor {
+public:
+    Monitor();
+    ~Monitor();
+    
+    void initialize();
+
+private:
+    void sportModeStateCallback(const void* message);
+    void odometryCallback(const void* message);
+    
+    std::unique_ptr<unitree::robot::ChannelSubscriber<unitree_go::msg::dds_::SportModeState_>> sport_mode_state_subscriber_;
+    std::unique_ptr<unitree::robot::ChannelSubscriber<nav_msgs::msg::dds_::Odometry_>> odometry_subscriber_;
+};
+
+} // namespace custom
+
+#endif // MONITOR_HPP