Added Polyline Python interface

[ahcorde]

Signed-off-by: ahcorde [email protected]

🎉 New feature

This PR is part of this meta ticket #931

Summary

Added Polyline Python interface

Test it

from sdformat import Polyline

polyline = Polyline()

Checklist

• Signed all commits for DCO
• Added tests
• Added example and/or tutorial
• 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 and edit the commit message to match the pull request summary while retaining Signed-off-by messages.

[codecov]

Codecov Report

Merging #1084 (673ec36) into main (b001313) will decrease coverage by 0.03%.
The diff coverage is 59.25%.

@@            Coverage Diff             @@
##             main    #1084      +/-   ##
==========================================
- Coverage   83.14%   83.11%   -0.04%     
==========================================
  Files         154      155       +1     
  Lines       18736    18763      +27     
==========================================
+ Hits        15578    15594      +16     
- Misses       3158     3169      +11     

Impacted Files	Coverage Δ
python/src/sdf/pyPolyline.cc	57.69% <57.69%> (ø)
python/src/sdf/_gz_sdformat_pybind11.cc	100.00% <100.00%> (ø)

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