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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## 📚 Documentation

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name: Documentation improvement
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## 📚 Documentation

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