Function init_rigid_bodies 

pub fn init_rigid_bodies(
    commands: Commands<'_, '_>,
    context_links: RapierContextLinkResolver<'_, '_>,
    rigidbody_sets: Query<'_, '_, (Entity, &mut RapierRigidBodySet)>,
    rigid_bodies: Query<'_, '_, RigidBodyComponents<'_>, Without<RapierRigidBodyHandle>>,
    gyroscopic_forces: Query<'_, '_, &GyroscopicForces>,
)

System responsible for creating new Rapier rigid-bodies from the related bevy_rapier components.