please add a Migration Guide from v3

[xmasuhai]

Clear and concise description of the problem

I was originally using version v3, but now when I upgraded to version v4, I encountered an error during project packaging: Property 'xxx' does not exist on type '_StoreWithState<"xxx".... After carefully reviewing the API documentation, I realized that the path used in version v3 has been deprecated and has been replaced by the pick in the current v4 version.

Suggested solution

Hope to add a chapter on Migration Guide from v3 in the documentation.

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.

[prazdevs]

That can be an idea to add some migration, as for now, you can refer to the changelog and breaking changes if you need it

https://github.com/prazdevs/pinia-plugin-persistedstate/blob/main/CHANGELOG.md#v400