Update pyproject.toml to adjust optional dependencies and include backbone folder

[cv-olvera]

This PR makes the following updates to the pyproject.toml configuration:

• Gradio and Numpy are now marked as optional dependencies, allowing users to install the package without these dependencies unless explicitly needed.
• The version constraint for huggingface-hub has been updated from >=0.28.1 to <=0.30.2 to maintain compatibility with the specified version range.
• The include field has been updated to ["zonos", "zonos.*"], ensuring that the entire zonos package, including the backbone folder, is included when the package is installed.

These changes aim to improve flexibility and compatibility for users while ensuring the backbone folder is packaged correctly.