Complete ROS2 migration: ProfilePublisher, StatsPublisher, and liveprofile

[Copilot]

Completes ROS2 migration of remaining ROS1 components. ProfilePublisher and StatsPublisher now accept rclcpp::Node* for integration into downstream libraries.

C++ Publishers

API Change: Both publishers now require node pointer injection:

// ROS1
ProfilePublisher publisher(profiler);

// ROS2
ProfilePublisher publisher(profiler, node_ptr);

• Replaced ros::Publisher → rclcpp::Publisher<T>::SharedPtr
• Replaced ros::NodeHandle → rclcpp::Node* parameter
• Updated message types: std_msgs::String → std_msgs::msg::String

Python Script

Migrated scripts/liveprofile:

• rospy → rclpy with Node inheritance
• Time handling: rospy.get_rostime() → self.get_clock().now()
• Python 3 compatibility fixes

Build System

• Added rclpy exec dependency
• Exported rosidl_default_runtime
• Added ament_lint_auto support
• Installed Python script

Documentation

• Updated README with ROS2 usage patterns
• Added .gitignore for ROS2 build artifacts

Original prompt

Check whether the changes I already made are correct for migrating to ROS2. Also convert all code to ROS2. Keep in mind the ProfilePublisher should be usable by other libraries. In the way of execution the user wants. Also pay attention to doc generation, testing, linting including linting of CMakeLists and package.xml

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