Added gravity feature to bullet-featherstone

[ahcorde]

Signed-off-by: ahcorde [email protected]

🎉 New feature

Summary

Added gravity to bullet-featherstone. Also fixed a bug when loading the world related to sdf bullet tags

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 #375 (3de9702) into ahcorde/suggestions/373 (4202ab6) will increase coverage by 4.47%.
The diff coverage is 96.15%.

@@                     Coverage Diff                     @@
##           ahcorde/suggestions/373     #375      +/-   ##
===========================================================
+ Coverage                    68.27%   72.75%   +4.47%     
===========================================================
  Files                          137      138       +1     
  Lines                         6365     6380      +15     
===========================================================
+ Hits                          4346     4642     +296     
+ Misses                        2019     1738     -281     

Impacted Files	Coverage Δ
bullet-featherstone/src/plugin.cc	100.00% <ø> (ø)
bullet-featherstone/src/WorldFeatures.cc	92.30% <92.30%> (ø)
bullet-featherstone/src/SDFFeatures.cc	68.14% <100.00%> (+68.14%)	⬆️
bullet-featherstone/src/Base.hh	80.51% <0.00%> (+68.83%)	⬆️

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