图片预览组件是否支持视频或者加一个插槽

[zhigge]

• I have searched the issues of this repository and believe that this is not a duplicate.

What problem does this feature solve?

在图片和视频混合在一起的时候，即可浏览图片也可浏览视频。视频默认展示封面

What does the proposed API look like?

直接加视频可能对拓展性不友好。我建议加一个插槽类型的。这样可以自由的组合。当然最后加一些区分，让我们可以自己配置一些加载方式，播放方式等

  <a-image-preview-group>
    <a-image :width="200" src="https://aliyuncdn.antdv.com/vue.png" />
    <a-image :width="200" src="https://aliyuncdn.antdv.com/logo.png" />
  </a-image-preview-group>

[github-actions]

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