SDF to MJCF: SDF World support

[ahcorde]

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

🎉 New feature

Summary

World support

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 #37 (2fc5116) into main (c6c75ff) will increase coverage by 0.22%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #37      +/-   ##
==========================================
+ Coverage   95.83%   96.05%   +0.22%     
==========================================
  Files           9       10       +1     
  Lines         264      279      +15     
==========================================
+ Hits          253      268      +15     
  Misses         11       11              

Impacted Files	Coverage Δ
...ormat_to_mjcf/sdformat_to_mjcf/converters/model.py	100.00% <ø> (ø)
...format_to_mjcf/sdformat_to_mjcf/converters/link.py	100.00% <100.00%> (ø)
...ormat_to_mjcf/sdformat_to_mjcf/converters/world.py	100.00% <100.00%> (ø)

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