MJCF to SDFormat: Add conversion for meshes.

[azeey]

🎉 New feature

Summary

In addition to the conversion, meshes are exported to a meshes subdirectory inside the output directory (the parent directory of the output file).

710dc34af9d918a3cd84842cce54b4728ad99633 refactors test_add_mjcf_geometry_to_sdf.py to avoid duplication.

Test it

test_add_mjcf_geometry_to_sdf.py test_mjcf_to_sdformat.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 #71 (de28e28) into main (5c88830) will increase coverage by 1.40%. The diff coverage is 93.75%.

@@            Coverage Diff             @@
##             main      #71      +/-   ##
==========================================
+ Coverage   93.75%   95.16%   +1.40%     
==========================================
  Files          24       24              
  Lines        1073     1096      +23     
==========================================
+ Hits         1006     1043      +37     
+ Misses         67       53      -14     

Impacted Files	Coverage Δ
sdformat_mjcf/src/sdformat_mjcf/utils/sdf_utils.py	90.17% <71.42%> (-1.34%)	:arrow_down:
...ormat_mjcf/mjcf_to_sdformat/converters/geometry.py	96.55% <100.00%> (+0.39%)	:arrow_up:
...ormat_mjcf/mjcf_to_sdformat/converters/material.py	95.00% <100.00%> (+3.69%)	:arrow_up:
...sdformat_mjcf/mjcf_to_sdformat/mjcf_to_sdformat.py	100.00% <100.00%> (+100.00%)	:arrow_up:

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[azeey]

Looks like the codecov/patch is mainly complaining about removed lines. Will go ahead and merge