Added the ip and port as launch arguments in the ros2 launch file

[Elie-Y]

Proposed change(s)

Modified the ros2 launch file by adding the Ip and Port as launch arguments

Types of change(s)

• Bug fix
• New feature
• Code refactor
• Documentation update
• Other (please describe)

Testing and Verification

I tested it using ROS2 Galactic,
ros2 launch ros_tcp_endpoint endpoint.py ROS_IP:=127.0.0.1 ROS_TCP_PORT:=10001

Test Configuration:

• Unity Version: [e.g. Unity 2020.3.30f1]
• Unity machine OS + version: Linux mint 20.3 Cinnamon
• ROS machine OS + version: Linux mint 20.3 Cinnamon, ROS2 Galactic
• ROS–Unity communication: Direct, Docker

Checklist

• Ensured this PR is up-to-date with the dev branch
• Created this PR to target the dev branch
• Followed the style guidelines as described in the Contribution Guidelines
• Added tests that prove my fix is effective or that my feature works
• Updated the Changelog and described changes in the Unreleased section
• Updated the documentation as appropriate

Other comments

[unity-cla-assistant]

All committers have signed the CLA.

[StephanHasler]

BTW: The naming of the parameters is inconsistent with the ROS1 version.
There the parameters are tcp_ip and tcp_port. Also the internal variables are called likewise.
See #123 why the ROS1 naming might be preferable.