Bring back feature for plotting pose attributes from Component Inspector (backport #2835)

[mergify]

🦟 Bug fix

Summary

The ability to plot poses was added in #1607 for Fortress (ign-gazebo6). It seems like this feature was not forward ported to newer versions. This PR adds the feature back. When you expand the Pose item in the Component Inspector GUI plugin, you should now see the plot icon next to each pose attribute.

To test

1. Open Plotting GUI Plugin
2. Click on any model in scene
3. Go to Component Inspector, expand Pose
4. Plot any one of the pose attribute by dragging it to the plot
5. Hit Play to see it being plotted

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.

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This is an automatic backport of pull request #2835 done by [Mergify](https://mergify.com).