maximize the bandwidth used by dividing large files into smaller parts
and transferring them simultaneously using multiple threads.
This approach can potentially double the transfer speed.
To use `hf_transfer`:  
1. Specify the `hf_transfer` extra when installing `huggingface_hub`
(e.g. `pip install huggingface_hub[hf_transfer]`).
2. Set `HF_HUB_ENABLE_HF_TRANSFER=1` as an environment variable.