Tech Demo / Draft: Add python REPL via jupyter notebook kernel to the frontend

[MalteEbner]

What has changed and why?

Creates a tech demo of having a python REPL in the frontend. It uses a Jupyter notebook kernel in the backen.

How has it been tested?

Evaluation

Good:

• Design is nice, you can just get it out and expand it and collapse it. Feels like the same application. The code highlighting is from monero (VSCode)
• Could easily add AI code gen or similar.
• Allows running arbitrary python code in the backend. For a real application, some security/auth would be needed.

Bad:

• No IDE support at all: telling which variables are unknown, which imports are missing, ...
• No file saving.
• No multiple files
• No multiple cells (compared to a real notebook).

Options / extension

Could replace the REPL with a real notebook. That would allow more coding features, but look and feel like a second application, not as the same.