Add particle emitters to link.proto and add topic to particle_emitter…

[nkoenig]

🎉 New feature

Summary

Adds particle_emitter to Link and adds 'topic' to the 'particle_emitter'. Both of these reflect additions to SDF.

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 #153 (ad47c0f) into main (903e79b) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #153   +/-   ##
=======================================
  Coverage   84.78%   84.78%           
=======================================
  Files           7        7           
  Lines         828      828           
=======================================
  Hits          702      702           
  Misses        126      126           

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