[DO NOT MERGE] Copy of 2292

[jambayk]

add the hf_xet package to avoid the warning when downloading models from HuggingFace.

I checked the repo and would need some opinion of developers where to put the fix: there are 2 places:

requirements.txt contains the base dependencies that are always installed olive/olive_config.json contains extra_dependencies for optional features that users can install as needed (like pip install olive-ai[gpu], pip install olive-ai[lora], etc.) Since the warning occurs during the getting started example (a basic use case), and hf_xet improves download performance from HuggingFace for models with Xet Storage, it makes sense to add it as a base dependency in requirements.txt.

Proposed change:
Add hf_xet to the requirements.txt

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