Enabling hf-transfer by default

[AlpinDale]

hf_transfer, to my knowledge, has become very stable recently. I use it daily, and I find it a bit cumbersome that we have to manually install the package, then export a very long env variable to finally have access to faster downloads. I believe it's about time it was made the default behaviour for huggingface_hub. Thoughts? I'm sure many others in the community same the share belief as me.