Export pageInfoType

I would like to reference this type from my own custom implementations of a connection. If this library would export this GraphQL type, I would be able to use it and ensure my pageInfo schema is consistent with relay's. Thank!

Locate the pageInfoType definition and the package's public export entry point. Check existing export tests or import patterns, then expose the type for custom connection implementations and verify that it can be imported while preserving the Relay-compatible pageInfo schema.

Written by the indexing model from the issue text.