Improve logic for creating unique names.

[azeey]

🎉 New feature

Summary

The new logic uses MJCF's Namescope to check if a given name exists in a given namespace. If so it adds an incrementing numeric suffix until a unique name is found.

Test it

Run test_name_collisions.py

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 #45 (f0797a6) into main (0bef4bb) will not change coverage. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main      #45   +/-   ##
=======================================
  Coverage   97.09%   97.09%           
=======================================
  Files          14       14           
  Lines         482      482           
=======================================
  Hits          468      468           
  Misses         14       14           

Impacted Files	Coverage Δ
...at_to_mjcf/sdformat_to_mjcf/converters/geometry.py	92.30% <ø> (-0.12%)	:arrow_down:
...format_to_mjcf/sdformat_to_mjcf/converters/link.py	100.00% <ø> (ø)
...ormat_to_mjcf/sdformat_to_mjcf/converters/joint.py	96.96% <100.00%> (+0.04%)	:arrow_up:

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