Integrate HuggingFace API: Support Go-based model downloading

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Background

To enhance the usability of this minimalist ML framework, it is planned to integrate HuggingFace's model hub API.

Feature Proposal

• Add Go code/API that enables users to download models directly from HuggingFace to local storage.
• Provide simple and idiomatic Go methods or CLI for specifying model names and target directories.
• Consider model caching, update, and basic error handling.
• Ensure easy extensibility for additional HuggingFace features in the future.

Possible Steps

1. Investigate HuggingFace Hub API endpoints and authentication (if needed).
2. Implement HTTP(s) based Go client for model asset pull.
3. Document the workflow and provide usage examples.