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.
# pyodide.code

```{eval-rst}
.. currentmodule:: pyodide.code

.. automodule:: pyodide.code
   :members:
   :autosummary:
   :autosummary-no-nesting:
```

# pyodide.code

```{eval-rst}
.. currentmodule:: pyodide.code

.. automodule:: pyodide.code
   :members:
   :autosummary:
   :autosummary-no-nesting:
```
