add VitePress integration

[userquin]

Clear and concise description of the problem

Finally VitePress has been released with the buildEnd hook: we can now create an integration here using the code in the VitePress PR: vuejs/vitepress#709 (comment)

Suggested solution

Just add a new integration for VitePress: add a factory function to create the async buildEnd hook.

I need to check the logic for this integration!.

Alternative

No response

Additional context

No response

Validations

• Follow our Code of Conduct
• Read the Contributing Guide.
• Check that there isn't already an issue that request the same feature to avoid creating a duplicate.

[userquin]

Released initial version for vitepress integration