feat(InputUpload): add ` ShowProgress` attribute

[ice6]

Is there an existing issue for this?

• I have searched the existing issues

Is your feature request related to a problem? Please describe the problem.

when uploading, I want to show a progress indicator.

Describe the solution you'd like

as title described.

Additional context

a spinning circle animation on the upload button is better than nothing :P

[bb-auto]

@ice6 Thank you for contacting us. We will give feedback later.

[ArgoZhang]

@ice6 How should the progress UI be designed? This mode does not provide a progress bar, so we need to find a solution for how to display it. Do you have any ideas?

[ice6]

@ArgoZhang Hi, I think simply make the Button spin, and add a ProgressBar at the bottom(overlay) of the InputBox is OK.

also it will be wonderful to have a Drag And Drop upload Component , like this:

https://dribbble.com/shots/17590793-CSV-uploader

and this:

https://element-plus.org/zh-CN/component/upload.html#%E6%8B%96%E6%8B%BD%E4%B8%8A%E4%BC%A0

https://codepen.io/incentive/pen/mdwoVqO

[ArgoZhang]

@ice6 AvatarUpload ButtonUpload CardUpload InputUpload these all support drag drop upload funcation.