Add ROS 2 Jazzy compatibility for Gazebo simulation

This update integrates ROS 2 Jazzy compatibility into the Gazebo simulation stack, enhancing the clearpath_manipulator_description package with necessary configuration files and updates.

Author: gaudelbijay

README.md

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+This update adds ROS 2 Jazzy compatibility for the Gazebo simulation stack within the clearpath_manipulator_description package. Specifically, it integrates the Universal Robots URDF/Xacro file with ROS 2’s control and Gazebo Sim (Harmonic) interfaces.
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+### 🧩 Key Changes
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+Added ROS 2 Jazzy–compatible simulation configuration files.
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+Updated universal_robots.urdf.xacro to support ROS 2 control (ros2_control) and Gazebo plugins.
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+Ensured compatibility with the Clearpath manipulator stack for ROS 2 (Jazzy).