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.
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---
name: Code improvement
about: Suggest a code improvement, i.e. refactoring, deprecation, etc.
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labels:
assignees: ""
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## Proposed refactoring or deprecation

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