chore(upload): use uid && fix handleDelete

[electroluxcode]

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fix #3867
fix #3871
fix #3850
使用者像之前一个传入 file 的 list 和 list[] 的时候不会受影响，在此基础上跟imgUpload一样添加了对单个值的处理(例如:"url")。绑定的form表单值也不会收到影响。

然后受到最大影响的是 暴露出来的 handleDelete 和 handleAdd，这两者传参进行了重构