Update typescript definition

[ArtemFrantsiian]

Description

In this example you show how work with interactive click. But if you try to do this in typescript you get an error about pointerdown and anchor. So I think that just need add pointerdown to index.d.ts for Sprite and change anchor to take number[], because when I've done this all worked.
And please add into documentation the section how works with different events in React style (mouseover, click, drag'n'drop, etc..)

Steps to reproduce

<Sprite
  texture={texture}
  x={25}
  y={680}
  interactive={true}
  pointerdown={this._onClick}
 >
    <Text text="CLICK"/>
</Sprite>

Give an error:
Property 'pointerdown' does not exist on type 'IntrinsicAttributes & SpriteProperties & { children?: ReactNode; }'

Additional info

[inlet]

I'm currently rewriting the complete definition file as it was quite a mess. 😉