Added particle emitters to scene broadcaster

[nkoenig]

Signed-off-by: Nate Koenig nate@openrobotics.org

🎉 New feature

Summary

Adds particle emitters to the scene broadcaster.

Test it

You can either run the test, or run world with a particle emitter and manually call the scene/info service.

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.

[codecov]

Codecov Report

Merging #1516 (1d856cd) into ign-gazebo6 (9c60c16) will increase coverage by 0.02%.
The diff coverage is 94.73%.

@@               Coverage Diff               @@
##           ign-gazebo6    #1516      +/-   ##
===============================================
+ Coverage        63.98%   64.00%   +0.02%     
===============================================
  Files              317      317              
  Lines            25509    25528      +19     
===============================================
+ Hits             16321    16339      +18     
- Misses            9188     9189       +1     

Impacted Files	Coverage Δ
src/systems/scene_broadcaster/SceneBroadcaster.cc	92.43% <94.73%> (+0.09%)	⬆️

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[caguero]

Looks good to me!