设置 CompositeCollider2D 是否将使用碰撞体。
在使用 CompositeCollider2D 时，该碰撞体几何形状与使用同一复合碰撞体的其他任何碰撞体合并在一起。
当一个碰撞体由某个复合碰撞体使用时，Editor 将忽略并且不显示 Collider2D.sharedMaterial、Collider2D.isTrigger 和 Collider2D.usedByEffector 属性，而是使用 CompositeCollider2D 上的相同属性。应将复合碰撞体的这些属性设置为将所有碰撞体均合并到复合碰撞体中。
仅在 BoxCollider2D 和 PolygonCollider2D 上可获得该 usedByComposite 属性。
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