Simulation: Create ROS2 Launch files for NaviGator Gazebo Simulation

[CarterKreis]

Background

• As part of the NaviGator's migration to ROS2, we need to bring over the Gazebo Simulation environment
• In this issue, we will write the python launch files: gazebo.launch.py and navigator_setup.launch.py

Specifications

• Gazebo.launch.py should launch the Gazebo Simulation world
• The launch file can and should closely follow the existing one for subjugator (link)
• Navigator_setup.launch.py should launch the necessary ROS2 Nodes and Packages for the Gazebo Simulation and physical NaviGator to be fully ready
• Similarly, this launch file should closely match the existing one for subjugator (link)

Testing

• Run the launch files with no errors
• Verify that the Gazebo Simulation runs

[CarterKreis]

I am basing the nav launch files off the subjugator ones. So far, I have updated the naming conventions, but I still need to verify the packages and nodes that will be built in the launch files. This should be done by next week for sure

[CarterKreis]

Still working on this unfortunately. I would like to finish this by next week but I am getting some add errors and planning to re-install mil2 repo to try and fix.