[backport Humble] Added conversion for Detection3D and Detection3DArray (#523)

[ahcorde]

🦟 Bug fix

Summary

Checklist

• [ ] Signed all commits for DCO
• [ ] Added tests
• [ ] 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.

[iche033]

are the build failures expected?

[ahcorde]

@iche033 This is the humble branch not sure why this is compiling against rolling too

[iche033]

ok sounds like a separate CI setup issue.

[ahcorde]

ok sounds like a separate CI setup issue.

@iche033 https://github.com/gazebosim/ros_gz/pull/527