Add a "Code Decompilation" notebook to showcase function inspection and decompilation.

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A new Jupyter notebook titled "Code Decompilation" has been added to the "03_advanced_python" section of the repository, demonstrating the concept of code decompilation using a Python decorator with the dis module and the uncompyle6 library. Additionally, the _toc.yml file has been updated to include a reference to this new notebook in the "Advanced techniques" section.

closes #69