MJCF to SDF: Added gravity, wind and magnetic field

[ahcorde]

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

🎉 New feature

Summary

Added gravity, wind and magnetic field

Checklist

• [x] Signed all commits for DCO
• [ ] Added tests
• [ ] Added example and/or tutorial
• [x] 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 #56 (a39bdc3) into main (d559811) will increase coverage by 0.03%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #56      +/-   ##
==========================================
+ Coverage   97.79%   97.83%   +0.03%     
==========================================
  Files          16       16              
  Lines         636      646      +10     
==========================================
+ Hits          622      632      +10     
  Misses         14       14              

Impacted Files	Coverage Δ
...f_to_sdformat/mjcf_to_sdformat/converters/world.py	97.22% <100.00%> (+1.06%)	:arrow_up:

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