Support for //link//light

[ahcorde]

🎉 New feature

Summary

it requires https://github.com/gazebosim/sdformat/pull/989

Related with this issue https://github.com/gazebosim/gz-mujoco/issues/11

This PR adds lights to links

Checklist

• [ ] Signed all commits for DCO
• [ ] 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)
• [ ] 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.

[ahcorde]

it requires https://github.com/gazebosim/sdformat/pull/1013

[codecov[bot]]

Codecov Report

Merging #19 (ebc57d2) into main (135d294) will increase coverage by 2.32%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #19      +/-   ##
==========================================
+ Coverage   89.41%   91.73%   +2.32%     
==========================================
  Files           6        8       +2     
  Lines         189      230      +41     
==========================================
+ Hits          169      211      +42     
+ Misses         20       19       -1     

Impacted Files	Coverage Δ
sdformat_mjcf/sdformat_mjcf/converters/light.py	100.00% <100.00%> (ø)
sdformat_mjcf/sdformat_mjcf/converters/link.py	100.00% <0.00%> (ø)
sdformat_mjcf/sdformat_mjcf/sdf_utils.py	68.75% <0.00%> (+16.57%)	:arrow_up:

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