Teleop: make default velocities configurable

[ntfshard]

🎉 New feature

Closes #

Summary

Teleop plugin can be used with various types of machines.
And having configurable default velocity values is a quality of life improvement.

To spawn plugin, add to world (maybe you also need rest default GUI plugins)

    <gui>
      <plugin filename="Teleop" name="Teleop">
        <gz-gui>
          <property type="string" key="state">docked</property>
        </gz-gui>
        <topic>/cmd_vel</topic>
        <max_forward_velocity>14</max_forward_velocity>
        <max_vertical_velocity>2</max_vertical_velocity>
        <max_yaw_velocity>3</max_yaw_velocity>
      </plugin>
    </gui>

Backport Policy

• This is safe to backport to the following versions:
  • Jetty
  • Ionic
  • Harmonic
  • Fortress
• This should not be backported
• I am not sure
• Other (fill in yourself)

Test it

Checklist

• Signed all commits for DCO
• Added a screen capture or video to the PR description that demonstrates the feature
• 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)
• Updated Bazel files (if adding new files). Created an issue otherwise.
• While waiting for a review on your PR, please help review another open pull request to support the maintainers
• Was GenAI used to generate this PR? If so, make sure to add "Assisted-by" to your commits. (See this policy for more info.)

Note to maintainers: Remember to use Squash-Merge and edit the commit message to match the pull request summary while retaining Signed-off-by and Generated-by messages.

Backports: If this is a backport, please use Rebase and Merge instead.

[ahcorde]

Do you mind to target main?

[ntfshard]

Do you mind to target main?

Just follow the rules: https://gazebosim.org/docs/all/contributing/#contributing-code

Right now I'm on vacation, and mine development setup is a miles away. I guess I can create a PR to main when I return