a-upload needs to display the upload progress value

[computer-idol]

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

What problem does this feature solve?

默认的进度上传只有进度条，没有显示出进度数值，尤其是上传视频，让用户可以清晰地看到还有多少没有上传完成

What does the proposed API look like?

操作系统：win10
浏览器版本： chrome 91.0.4472.124
Vue版本: v2

[tangjinzhou]

数据在你接口里已经有了 自行展示即可

[github-actions]

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