feat: support line numbers in frontmatter

[yangxingyuan]

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

Now the lineNumbers config only exists in markdown.lineNumbers, but it will be better if the frontmatter can expose the lineNumber config to give user fine-grained control. For example:

---
lineNumdbers: true
---

Describe the solution you'd like

See above.

Describe alternatives you've considered

No response

Additional context

No response

Validations

• Read the docs.
• Read the Contributing Guidelines.
• Check that there isn't already an issue that asks for the same feature to avoid creating a duplicate.