MJCF->SDFormat: Fix sizes for infinite planes

[azeey]

🦟 Bug fix

Summary

A size of [0, 0] is interpreted as an infinite plane for the purpose of visualization in Mujoco, but Gazebo treats it a size of 0, so instead, we use a very large size.

Checklist

• [ ] Signed all commits for DCO
• [ ] Added tests
• [ ] Updated documentation (as needed)
• [ ] Updated migration guide (as needed)
• [ ] Consider updating Python bindings (if the library has them)
• [ ] codecheck passed (See contributing)
• [ ] 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 #64 (8918249) into main (ab8fd15) will increase coverage by 0.01%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #64      +/-   ##
==========================================
+ Coverage   97.20%   97.22%   +0.01%     
==========================================
  Files          19       19              
  Lines         824      828       +4     
==========================================
+ Hits          801      805       +4     
  Misses         23       23              

Impacted Files	Coverage Δ
...o_sdformat/mjcf_to_sdformat/converters/geometry.py	96.15% <100.00%> (+0.20%)	:arrow_up:

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