feat: Cortex pull from HF can select quantization

[louis-jan]

Describe the bug
When pulling a model from HF, I could not select the model quantization, it downloads the first one by default (lowest quality)

To Reproduce
Steps to reproduce the behavior:

1. run cortex
2. pull any models on HF E.g. TheBlock/Tiny
3. it pulls Q2 by default
4. see error

Expected behavior
It should prompt users to select the quantization they want to pull

[Van-QA]

The issue is reproducible and needs ‌‌investigation from dev team, but since we are focusing on the cortex.cpp, I think we can wait until this feature is implemented in the new version of cortex.cpp

[dan-menlo]

@namchuai I am converting this into a feature, as it's a part of cortex pull and cortex run functionality.

We can close ticket once you have verified that cortex.cpp can trigger quantization selection when downloading HF GGUF download