When using page routes we need to pass the contents of the `export const config` to the `extraConfig` populating the functions config manifest rather then relying on named exports like in app router.
remaining:
- add tests
caveat: this only works at the route level, we won't inherit from the layout or anything. I think that's fine
Co-authored-by: Florentin / 珞辰 <8146736+ecklf@users.noreply.github.com>