Added particle_emitter vector message

[nkoenig]

🎉 New feature

Summary

Add a particle_emitter_v message which contains a repeated ParticleEmitter.

This is part of a series of pull requests designed to support particle emitter in gz3d.
See also:

• Added particle_emitter vector message #149
• Particle emitter based on SDF gz-sim#730
• Support particle_emitters in the websocket server gz-launch#104

Test it

Checklist

• Signed all commits for DCO
• Added tests
• Added example and/or tutorial
• Updated documentation (as needed)
• Updated migration guide (as needed)
• 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

[codecov]

Codecov Report

Merging #149 (83b50e5) into ign-msgs6 (699e7c3) will not change coverage.
The diff coverage is n/a.

❗ Current head 83b50e5 differs from pull request most recent head 3a9d842. Consider uploading reports for the commit 3a9d842 to get more accurate results

@@            Coverage Diff             @@
##           ign-msgs6     #149   +/-   ##
==========================================
  Coverage      84.59%   84.59%           
==========================================
  Files              7        7           
  Lines            818      818           
==========================================
  Hits             692      692           
  Misses           126      126           

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 699e7c3...3a9d842. Read the comment docs.