Python: Allow the code interpreter plugin to call "local" plugins

[madsbolaris]

It should be possible to describe the available plugins as python classes/functions to the AI so that it can invoke those functions within the python code interpreter.

Behind the scenes, we should recreate the function calling behavior of OpenAI. As the python code interpreter wants to invoke functions, it should make a "call" back to the client so it can invoke the function and pass it back to the code interpreter.

[github-actions]

This issue is stale because it has been open for 90 days with no activity.