Add EntityPlugin_V msg

[iche033]

Signed-off-by: Ian Chen ichen@osrfoundation.org

🎉 New feature

Summary

Adds an EntityPlugin_V.proto msg to store plugins / systems for an Entity.

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 #261 (fe0a9ec) into ign-msgs8 (7e1b8d4) will increase coverage by 69.93%.
The diff coverage is n/a.

@@              Coverage Diff               @@
##           ign-msgs8     #261       +/-   ##
==============================================
+ Coverage      15.44%   85.38%   +69.93%     
==============================================
  Files            382        9      -373     
  Lines          65279      951    -64328     
==============================================
- Hits           10083      812     -9271     
+ Misses         55196      139    -55057     

Impacted Files	Coverage Δ
include/ignition/msgs/cylindergeom.pb.cc
include/ignition/msgs/world_control.pb.h
include/ignition/msgs/axis.pb.h
include/ignition/msgs/pose_v.pb.h
include/ignition/msgs/empty.pb.h
include/ignition/msgs/response.pb.cc
include/ignition/msgs/fluid_pressure.pb.h
include/ignition/msgs/user_cmd_stats.pb.h
include/ignition/msgs/version.pb.cc
include/ignition/msgs/gui_camera.pb.h
... and 381 more

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