SDFormat to MJCF: Add conversion for camera sensor

[azeey]

🎉 New feature

Toward #16

Summary

It turns out there is not much to convert for cameras since Mujoco cameras are really not sensors. I added a warning just to let the user know that almost none of the sensor parameters are mapped.

Test it

test_add_sensor.py test_add_link.py

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)
• [ ] 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 #60 (2457fab) into main (9e0e6e6) will increase coverage by 0.02%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #60      +/-   ##
==========================================
+ Coverage   97.83%   97.85%   +0.02%     
==========================================
  Files          16       16              
  Lines         646      653       +7     
==========================================
+ Hits          632      639       +7     
  Misses         14       14              

Impacted Files	Coverage Δ
...rmat_to_mjcf/sdformat_to_mjcf/converters/sensor.py	100.00% <100.00%> (ø)

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