Add SDFormat to MJCF converter script

[azeey]

🎉 New feature

Summary

This contains all the changes in #2, #4, and #5. The goal is to split out the remaining changes into separate smaller PRs.

Test it

See README.

Checklist

• [x] Signed all commits for DCO
• [x] 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)
• [ ] 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 #6 (bd25eb4) into main (a580cce) will increase coverage by 0.88%. The diff coverage is 98.18%.

@@            Coverage Diff             @@
##             main       #6      +/-   ##
==========================================
+ Coverage   96.05%   96.94%   +0.88%     
==========================================
  Files          10       11       +1     
  Lines         279      327      +48     
==========================================
+ Hits          268      317      +49     
+ Misses         11       10       -1     

Impacted Files	Coverage Δ
sdformat_to_mjcf/sdformat_to_mjcf/cli.py	90.90% <90.90%> (ø)
...ormat_to_mjcf/sdformat_to_mjcf/converters/model.py	100.00% <100.00%> (ø)
...format_to_mjcf/sdformat_to_mjcf/converters/root.py	100.00% <100.00%> (ø)
...format_to_mjcf/sdformat_to_mjcf/sformat_to_mjcf.py	100.00% <100.00%> (ø)

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[azeey]

This is ready for review. Note that #37 is implementing add_world.

[azeey]

conflicts

fixed