Add support to declare imports for code agent
Author: JasonZhu1313
Pull request: yes

# What does this PR do?

Collected suggestions and guidance from @aymeric-roucher!

Add support for declaring a list of available packages to import for the code agent. Previously, the code agent was limited to a fixed list of packages, which restricted its ability to utilize a wide range of Python's utilities and functionalities. By providing this import list explicitly, we aim to enable the model to leverage the provided packages.

## List of changes:
* Add "You can use imports in your code, but only from the following list of modules: <<authorized_imports>>" in prompt
* Add functions to render the prompt with authorized import list provided by users
* Fix a bug in test, the test is meant to add FinalAnswer in toolset but it added two duplicated PythonInterpreter tools.
* Added test for update prompt in python interpreter tool.

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