Add blender sdf export tutorial

[ddengster]

Signed-off-by: ddengster [email protected]

🎉 New feature

Summary

Adds a blender script to export models in the sdf format, accompanied with a simple tutorial as to how to use it.

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

[chapulina]

Thanks for the script! It has a lot of hardcoded values for things like casting shadows and bitmasks, but I think that this is a nice starting point that users can adapt to their needs. It would be nice to move these values to the top of the script to call attention to the fact that they can be customized.

[codecov]

Codecov Report

Merging #895 (3aaabae) into ign-gazebo5 (d3ee64a) will increase coverage by 0.28%.
The diff coverage is 63.28%.

❗ Current head 3aaabae differs from pull request most recent head 9d93d7d. Consider uploading reports for the commit 9d93d7d to get more accurate results

@@               Coverage Diff               @@
##           ign-gazebo5     #895      +/-   ##
===============================================
+ Coverage        65.32%   65.61%   +0.28%     
===============================================
  Files              240      243       +3     
  Lines            17624    18303     +679     
===============================================
+ Hits             11513    12009     +496     
- Misses            6111     6294     +183     

Impacted Files	Coverage Δ
include/ignition/gazebo/EntityComponentManager.hh	100.00% <ø> (ø)
include/ignition/gazebo/SdfEntityCreator.hh	100.00% <ø> (ø)
.../plugins/component_inspector/ComponentInspector.cc	6.69% <0.00%> (-0.52%)	⬇️
src/gui/plugins/scene3d/Scene3D.hh	50.00% <ø> (-16.67%)	⬇️
src/gui/plugins/shapes/Shapes.cc	22.72% <ø> (ø)
.../gui/plugins/transform_control/TransformControl.cc	18.00% <0.00%> (+2.87%)	⬆️
src/rendering/SceneManager.cc	24.88% <0.00%> (-0.20%)	⬇️
...ms/joint_traj_control/JointTrajectoryController.cc	78.20% <ø> (ø)
...ms/joint_traj_control/JointTrajectoryController.hh	100.00% <ø> (ø)
src/systems/physics/Physics.hh	100.00% <ø> (ø)
... and 44 more

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