Add custom copilot with local code interpreter

[mnicstruwig]

This PR adds an example custom copilot that makes use of a local code interpreter to write / execute code to answer the user's query.

It supports chart and tabular artifact output (by way of the OpenBB app integration).

The code interpreter is implemented in the Python standard lib, and spins up a separate process that uses a modified InteractiveConsole to execute code and capture output. We need to use a modified InteractiveConsole to capture both outputs from print statements, and also evaluated expressions (like a normal REPL would do), since GPT-4o seems to have been fine-tuned on interacting with a REPL, where the last expression is evaluated and returned.

The code interpreter was used as a workshop for the GAIN lecture that I was asked to do on the 14th of December 2024.

[montezdesousa]

do you expect the chart to be on the status update?

[montezdesousa]

LGTM. I'd just add an example on how to leverage the code interpreter through the chat interface