Parse URDF continuous joint effort/velocity limits

[scpeters]

🦟 Bug fix

Fixes #683.

Summary

This fixes parsing of effort and velocity limits for continuous joints in URDF files. A failing test was added in scpeters@75e4226 and fixed in 33e4b4d.

Checklist

• Signed all commits for DCO
• Added tests
• Updated documentation (as needed)
• Updated migration guide (as needed)
• 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

[codecov-commenter]

Codecov Report

Merging #684 (33e4b4d) into sdf9 (d087d47) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             sdf9     #684      +/-   ##
==========================================
+ Coverage   86.84%   86.88%   +0.03%     
==========================================
  Files          62       62              
  Lines        9738     9734       -4     
==========================================
  Hits         8457     8457              
+ Misses       1281     1277       -4     

Impacted Files	Coverage Δ
src/parser_urdf.cc	79.36% <100.00%> (+0.19%)	⬆️

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[iche033]

looks good to me.