[Bug] Formating not preserved when copy / paste outside appflowy

### Bug Description

Hello,

Consider this document

```
# Title

## Title 2

**Appflowy** is `great` !

```

When I copy this outside, I want the format to be persevered by keeping the ` and the * etc....

### How to Reproduce

Create block code or others things, paste them elsewhere, the backtick or format keys are not preserved

### Expected Behavior

the ## , ` are preserved etc...

### Operating System

MacOS

### AppFlowy Version(s)

0.7.1

### Screenshots

_No response_

### Additional Context

_No response_