[FR] Keyboard Shortcuts - Move Block/Line up/down, Copy Block/Line up/down like in VSC

### Description

I'd like to see 2 keyboard shortcuts added to AppFlowy Editor. The behaviour is best observed in Visual Studio Code editor.
Reference: [https://code.visualstudio.com/shortcuts/keyboard-shortcuts-windows.pdf](https://code.visualstudio.com/shortcuts/keyboard-shortcuts-windows.pdf)

Where Alt + ↑/↓ would Move line up/down and similarly Shift + Alt + ↑/↓ would Copy line up/down.

### Impact

Every user could benefit from the feature. Enabling the users for a faster workflow than having to reach for the mouse to use the drag and drop feature of rearranging the blocks.

### Additional Context

_No response_