Added sensor plugin to be able to visualize camera in plane_propeller_demo.sdf

[ahcorde]

🦟 Bug fix

Summary

When I tried to visualize the camera from this example I was not able except if I include this plugin.

Checklist

• Signed all commits for DCO
• Added tests
• 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

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[codecov]

Codecov Report

Merging #1226 (b679022) into ign-gazebo6 (442fbfd) will increase coverage by 14.99%.
The diff coverage is n/a.

❗ Current head b679022 differs from pull request most recent head eb74560. Consider uploading reports for the commit eb74560 to get more accurate results

@@               Coverage Diff                @@
##           ign-gazebo6    #1226       +/-   ##
================================================
+ Coverage        62.25%   77.25%   +14.99%     
================================================
  Files              275      227       -48     
  Lines            22710    13509     -9201     
================================================
- Hits             14138    10436     -3702     
+ Misses            8572     3073     -5499     

Impacted Files	Coverage Δ
src/gui/plugins/shapes/Shapes.cc	31.25% <0.00%> (-21.39%)	⬇️
...ems/collada_world_exporter/ColladaWorldExporter.cc	78.64% <0.00%> (-16.18%)	⬇️
src/systems/buoyancy/Buoyancy.cc	75.28% <0.00%> (-7.74%)	⬇️
src/LevelManager.cc	86.36% <0.00%> (-2.78%)	⬇️
...nclude/ignition/gazebo/components/Serialization.hh	92.85% <0.00%> (-2.70%)	⬇️
include/ignition/gazebo/components/Factory.hh	96.05% <0.00%> (-2.65%)	⬇️
src/Conversions.cc	81.83% <0.00%> (-1.87%)	⬇️
src/Server.cc	84.33% <0.00%> (-1.81%)	⬇️
.../systems/triggered_publisher/TriggeredPublisher.cc	81.97% <0.00%> (-1.69%)	⬇️
src/systems/imu/Imu.cc	72.28% <0.00%> (-0.97%)	⬇️
... and 140 more

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