MJCF to SDF: Added camera sensor

[ahcorde]

Signed-off-by: ahcorde ahcorde@gmail.com

🎉 New feature

Summary

It requires https://github.com/gazebosim/sdformat/pull/997

Added camera sensor and it allows to export the world plugins. In Gazebo, the simulation requires the Sensor system plugin to be able to simulate sensors

Checklist

• [x] Signed all commits for DCO
• [x] 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)
• [x] codecheck passed (See contributing)
• [x] All tests passed (See test coverage)
• [x] 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[bot]]

Codecov Report

Merging #49 (2c75bc2) into main (fbb5399) will increase coverage by 0.12%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #49      +/-   ##
==========================================
+ Coverage   97.41%   97.54%   +0.12%     
==========================================
  Files          17       18       +1     
  Lines         736      773      +37     
==========================================
+ Hits          717      754      +37     
  Misses         19       19              

Impacted Files	Coverage Δ
..._to_sdformat/mjcf_to_sdformat/converters/sensor.py	100.00% <100.00%> (ø)
...f_to_sdformat/mjcf_to_sdformat/converters/world.py	98.41% <100.00%> (+0.45%)	:arrow_up:

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