[Bug] serializeToMarkdown doesn't support nested lists

[alterhuman]

Bug Description

Using serializeToMarkdown to save editor content shows nested lists on top level itself when deserialized back to document format. It's working correctly when using json.

How to Reproduce

• Add data with nested numbered list
• Use serializeToMarkdown to store editor data
• Then load it back into the editor

Expected Behavior

The nesting should retain.

Operating System

MacOS

AppFlowy Editor Version(s)

2.3.0

Screenshots

No response

Additional Context

No response