Added Root::WorldByName

[nkoenig]

Signed-off-by: Nate Koenig nate@openrobotics.org

🎉 New feature

Summary

Adds "Root::WorldByName". Needed by gazebosim/gz-sim#1669

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.

[codecov]

Codecov Report

Merging #1121 (530cf24) into sdf13 (c703dee) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##            sdf13    #1121   +/-   ##
=======================================
  Coverage   87.26%   87.26%           
=======================================
  Files         125      125           
  Lines       16111    16118    +7     
=======================================
+ Hits        14059    14066    +7     
  Misses       2052     2052           

Impacted Files	Coverage Δ
src/Root.cc	95.19% <100.00%> (+0.15%)	⬆️

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