Move webbrowser.py into pyodide-py. ### Description

Moves our webbrowser.py stub into pyodide-py. It doesn't affect users, as pyodide-py is unpacked to /lib/python3.11/ during the initialization.

We won't need `pyodide.asm.data` anymore after we merge this and #3582.
// This file is just needed to make "npx tsd" work (otherwise it will quit with an error).

// This file is just needed to make "npx tsd" work (otherwise it will quit with an error).
