feat: add support HF model handle and quant selection

[namchuai]

Describe Your Changes

• Fix some issues with model download via CLI.
• Allow user to select model variant to pull.

Screenshots

1. When pull from cortex but user input an incompatible model repository. E.g. safetensor

2. When pull a model, display its variants

Fixes Issues

• feat: Cortex pull from HF can select quantization #1006
• bug: cortex pull from hf times out #1017

Self Checklist

• Added relevant comments, esp in complex areas
• Updated docs (for bug fixes / features)
• Created issues for follow-up changes or refactoring needed

[dan-menlo]

@namchuai Quick check, which issue does this address: #1006 or #1145?

I will add a bit to the original Github issues - I'd like to ensure we approach this correctly:

• API Design (for use to power Jan's Huggingface model download)
• CLI Design

[namchuai]

@namchuai Quick check, which issue does this address: #1006 or #1145?

I will add a bit to the original Github issues - I'd like to ensure we approach this correctly:

• API Design (for use to power Jan's Huggingface model download)
• CLI Design

@dan-homebrew , this PR will address #1006 and will adding support for user to enter hugging face handle like author/model_name. #1145 is already supported in another PR.

[nguyenhoangthuan99]

TODO:

• I'll integrate new model folder epic: Implement new Model Folder and model.yaml #1154 with this logic