add dynamic bone

[yangfengzzz]

Dynamic bones are generally used to add physics-based animation to character animation, and can be used for hair,
ribbons, tails, and even clothing. Enhanced effects of original character animation.

Although spring motion can also be realized with a physics engine such as PhysX, dynamic bones generally need to
customize some motion curves to meet artistic needs. Therefore, this repository implements a custom small physics engine
to meet this requirement. This physics engine only implements particle-based spring animation, plus Capsule, Sphere,
and Plane colliders.

  var entity = createEntity(rootEntity, new Vector3(1, -1, 0), new Color(0, 0.7, 0));
  entity.addComponent(MoveScript);
  let dynamicBone = entity.addComponent(DynamicBone);
  dynamicBone.setWeight(0.9);

  entity = createEntity(entity, new Vector3(1, -1, 0));
  dynamicBone.root = entity.transform;

  entity = createEntity(entity, new Vector3(1, -1, 0));
  entity = createEntity(entity, new Vector3(1, -1, 0));
  entity = createEntity(entity, new Vector3(1, -1, 0));
  entity = createEntity(entity, new Vector3(1, -1, 0));
  entity = createEntity(entity, new Vector3(1, -1, 0));
  entity = createEntity(entity, new Vector3(1, -1, 0));

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (f436352) 22.19% compared to head (b278803) 22.19%.

❗ Current head b278803 differs from pull request most recent head 291472f. Consider uploading reports for the commit 291472f to get more accurate results

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Additional details and impacted files

@@           Coverage Diff            @@
##           dev/1.1     #199   +/-   ##
========================================
  Coverage    22.19%   22.19%           
========================================
  Files           11       11           
  Lines          473      473           
  Branches        70       70           
========================================
  Hits           105      105           
  Misses         364      364           
  Partials         4        4           

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