Add InputManager

[yangfengzzz]

Refactor existing physical event logics from the collider and raycast. Redesign the APIs, which will be consistent with PhysX in the future.

PR reviewers：@GuoLei1990, @singlecoder, @gz65555 , @zhuxudong

[GuoLei1990]

Whether to unify single-point Touch and Mouse events needs to be discussed. From the point of view of ease of use for developers, I think we need to unify！
Before we only consider mouse, but now we should consider mobile device(touch). So the call back named onMouseXX() is not good, I thnk use onPointerXX() instead onMouseXX() or onTouchXX() is better for modern design.

class Script
{
  /**
     * Called when the pointer is down while over the Collider.
     */
    onPointerDown(): void {}
  
    /**
     * Called when the pointer is up while over the Collider.
     */
    onPointerUp(): void {}

    /**
     * Called when the pointer is down and up with the same collider.
     */
    onPointerClick(): void {}
  
    /**
     * Called when the pointer is enters the Collider.
     */
    onPointerEnter(): void {}
  
    /**
     * Called when the pointer is no longer over the Collider.
     */
    onPointerExit(): void {}

    /**
     * Called when the pointer is down while over the Collider and is still holding down.
     * @remarks onMouseDrag is called every frame while the pointer is down.
     */
    onPointerDrag(): void {}
}