Support more libraries in custom evaluators in Python

[mmabrouk]

Problem

You can currently create custom evaluators using Python code, however the libraries that can be used are heavily limited due to the use of RestrictedPython.
It would be great if we could use any library in custom code.

@BadCandy From Slack

I really like that Agenta allows defining custom evaluators in Python and registering them so they can be used within the UI during evaluation. However, I noticed that due to the restrictions of RestrictedPython, the libraries available for use are limited.
I have two questions regarding this:
Is there a way to use external libraries like scikit-learn in a custom evaluator, or is it currently not possible?

[mmabrouk]

Shipped