[examples] Speedup the caduceus

[alxbilger]

In the caduceus scene, the collision detection and the free motion can be computed in parallel.

Here are the timings for 1000 time steps on my computer:

Before

 LEVEL   START    NUM      MIN     MAX   MEAN     DEV    TOTAL  PERCENT ID
   0       0    1000       1.43    8.29    2.27    0.44 2266.53  100    TOTAL
   1       0       1       1.43    8.27    2.27    0.44    2.27   99.95 .Simulation::animate
   2       0.06    1       1.05    6.97    1.28    0.22    1.28   56.46 ..FreeMotion+CollisionDetection

[INFO] [BatchGUI] 1000 iterations done in 2.57462 s ( 388.407 FPS).

After

 LEVEL   START    NUM      MIN     MAX   MEAN     DEV    TOTAL  PERCENT ID
   0       0    1000       1.21    7.79    1.95    0.39 1948.88  100    TOTAL
   1       0       1       1.21    7.78    1.95    0.39    1.95   99.95 .Simulation::animate
   2       0.06    1       0.80    6.66    0.99    0.21    0.99   50.72 ..FreeMotion+CollisionDetection

[INFO] [BatchGUI] 1000 iterations done in 2.24415 s ( 445.602 FPS).

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Reviewers will merge this pull-request only if

• it builds with SUCCESS for all platforms on the CI.
• it does not generate new warnings.
• it does not generate new unit test failures.
• it does not generate new scene test failures.
• it does not break API compatibility.
• it is more than 1 week old (or has fast-merge label).

[hugtalbot]

same remark than in #2470 but I am fine with it 👍
(except that this scene example is 💩-unstable @fredroy we must create this new SOFA starting scene ;)

[alxbilger]

same remark than in #2470 but I am fine with it 👍 (except that this scene example is 💩-unstable @fredroy we must create this new SOFA starting scene ;)

Go Go Go!