Create bridge for GPSFix msg

[vincentrou]

🎉 New feature

Summary

Add gps_msgs/msg/GPSFix to be used with ros_gz_bridge.

Test it

ros2 run ros_gz_bridge parameter_bridge '/fix@gps_msgs/msg/GPSFix[ignition.msgs.NavSat'

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)
• [ ] While waiting for a review on your PR, please help review another open pull request to support the maintainers

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