Add controller name parameter (backport #212)

[mergify]

This is an automatic backport of pull request #212 done by Mergify.
Cherry-pick of b77f972 has failed:

On branch mergify/bp/iron/pr-212
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	both modified:   gz_ros2_control/src/gz_ros2_control_plugin.cpp

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To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/github/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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