Refactor dataset loading and preview functionality; add Hugging Face dataset loading feature with status updates

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Enhance download_hf_model function to support Hugging Face token for private models and improve success message

Enhance download_hf_model function to support custom output directory for model caching

Refactor dataset export functionality to save Hugging Face datasets as Arrow directories and update Gradio interface for improved user experience

Enhance main workflow to include downloadable dataset information and update UI for download options

Add intellectual property warning to Gradio interface

Add Hugging Face model download functionality and update UI with new tabs

Enhance sample generation with language support and update export options to include Parquet format

Add .gitignore file and update requirements.txt with additional dependencies

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Add application file