FIX [#58788]: Fixed useParams hook undesired re-renders and updated it to use PathParamsContext in the app router. (#60708)
Moved app-dir path params parsing logic from `useParams` to `AppRouter`.
This allows for the use of `PathParamsContext` in the `useParams` hook
for both pages and app routers. In addition, this allows for memoization
of the layout tree which fixes undesired re-renders of the `useParams`
hook.
Fixes [#58788](https://github.com/vercel/next.js/issues/58788)
Closes NEXT-2434
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Co-authored-by: Zack Tanner <zacktanner@gmail.com>