[Bug] Ctrl + V does not paste image from clipboard

### Bug Description

Attempting to paste an image from clipboard using Ctrl + V doesn't seem to work.

### How to Reproduce

- Copy an image into clipboard
- Attempt to paste into an AppFlowy document using Ctrl + V
- Observe image not being pasted
- Right click in the document -> Paste
- Observe image pasted

### Expected Behavior

Ctrl + V should also work to paste an image from clipboard.

### Operating System

Microsoft Windows [Version 10.0.19045.3086]

### AppFlowy Version(s)

0.3.0