Added initial documentation for ROS 2 simulation interfaces

[sauk2]

🎉 New feature

Related to gazebosim/ros_gz#732 and gazebosim/ros_gz#790

Summary

This PR adds initial documentation for using ROS 2 simulation interfaces (https://github.com/ros-simulation/simulation_interfaces) to interact with Gazebo. Other simulators such as Isaac Sim (https://docs.isaacsim.omniverse.nvidia.com/latest/ros2_tutorials/tutorial_ros2_simulation_control.html#ros2-simulation-control) and ODE3 (https://www.docs.o3de.org/docs/user-guide/interactivity/robotics/simulation-interfaces/) have already updated their documentations.

Test it

Checklist

• Signed all commits for DCO
• Added tests
• Added example and/or tutorial
• Updated documentation (as needed)
• Updated migration guide (as needed)
• Consider updating Python bindings (if the library has them)
• codecheck passed (See contributing)
• All tests passed (See test coverage)
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[azeey]

Thanks for the docs!!

Since I expect this to be a fairly large body of text over time, I think it would be better to create a new file and link to it from ros2_integration.

[sauk2]

Since I expect this to be a fairly large body of text over time, I think it would be better to create a new file and link to it from ros2_integration.

Thanks for the feedback! I have added it as a separate section

[azeey]

Added a known limitations section at the bottom. Otherwise, LGTM!

feedback has been addressed