Fix/issue #304 NeMo Guardrails packaging

[Pouyanpi]

Summary

This PR introduces several changes to the project's build process and packaging configuration, focusing on the pyproject.toml and NeMo Guardrails adjustments. The updates are designed to enhance how examples and chat-ui are packaged, specifically excluding them from site-packages. Additionally, this PR refines our path handling by implementing utility functions that adapt to different environments, whether the package is installed via pip or run from a cloned repository. It resolves #304.

Changes

• Update pyproject.toml: Revised to exclude examples and chat-ui directories from being packaged into site-packages. This modification prevents these directories from being unnecessarily deployed in production environments.

• Update Build Process: Updated build_wheel.yml to accommodate the changes in the packaging strategy, ensuring that our CI/CD pipeline reflects the new configuration.

• Add Utility Functions for Path Management: Added helper functions to manage data paths. These functions dynamically determine the correct paths for accessing package resources, whether the package is installed using pip or directly executed from a cloned repository.

• Code Cleanup and Refactoring: Removed examples/__init__.py and updated imports in examples/configs/rag/multi_kb/config.py to align with the new directory structure. This cleanup reduces otential confusion about the module's status as non-package content.

Testing

Thorough testing has been conducted to ensure that these changes do not break existing functionalities. The updates have been validated in both pip-installed environments and directly from source

[drazvan]

Nice one, @Pouyanpi!