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

# 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 tests for updating prompt in python interpreter tool.
* Replaced `*tools*` in DEFAULT_REACT_CODE_SYSTEM_PROMPT with <<tool_names>> which will later be replaced with a list of tool names to confine model on a list of possible tools it can invoke.
* Allow a reduction of parsing errors by adding exception handling blocks for `_, code_action = self.extract_action(llm_output=llm_output, split_token="Code:")
` and `rationale, raw_code_action = self.extract_action(llm_output=llm_output, split_token="Code:")`

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Comments:
@JasonZhu1313 you can check failing style tests [here](https://app.circleci.com/pipelines/github/huggingface/transformers/95299/workflows/06c184a3-c9ee-484e-994c-482bc72d60a0/jobs/1253690)

> @JasonZhu1313 you can check failing style tests [here](https://app.circleci.com/pipelines/github/huggingface/transformers/95299/workflows/06c184a3-c9ee-484e-994c-482bc72d60a0/jobs/1253690)

Done thanks!

Seems all good to me, thanks a lot @JasonZhu1313! @LysandreJik do you want to have a double check?

The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/transformers/pr_31355). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.