[Workflow API] Enable support for Importing helper utilities in FederatedRuntime notebooks

[refai06]

Summary

This PR addresses issue securefederatedai#1565 by enabling the import of user-defined helper functions and utilities from separate Python scripts in FederatedRuntime notebooks.

Type of Change (Mandatory)

Specify the type of change being made.

• Feature enhancement

Description (Mandatory)

PR enhances the CodeAnalyzer to support importing user-defined helper modules in FederatedRuntime notebooks by

• Detecting user-defined imports in the exported script.
• Resolving and copying relevant .py files or packages to generated_workspace/src.
• Ensuring user-defined code is available during remote (i.e director/envoy) experiment execution.

Testing

• Validated the FederatedRuntime tutorial with a user-defined module import.

[ishant162]

Overall looks OK but some error handling needs to be done to make it more robust

[Copilot]

Pull Request Overview

This PR enhances FederatedRuntime notebook support by enabling user-defined helper utilities to be imported and executed remotely.

• Update workspace context manager to include both the experiment directory and its src subdirectory in sys.path.
• Extend CodeAnalyzer to detect user-defined imports in the generated script and copy the corresponding .py files or packages into the workspace.
• Add helper methods for checking and resolving module paths.

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 5 comments.

File	Description
openfl/utilities/workspace.py	Enhanced __enter__/__exit__ to manage src directory on sys.path.
openfl/experimental/workflow/notebooktools/code_analyzer.py	Implemented __extract_user_defined_imports, __copy_user_defined_modules, _is_user_defined_module, and _get_module_paths; updated imports and type hints.

Comments suppressed due to low confidence (1)

openfl/experimental/workflow/notebooktools/code_analyzer.py:92

• Add unit tests for __extract_user_defined_imports and __copy_user_defined_modules to verify correct detection of user modules, including edge cases like nested packages, missing files, and different import styles.

def __extract_user_defined_imports(self, notebook_path) -> List[str]:

[ishant162]

Looks good. Please check the copilot review comments and incorporate if they make sense