Add AuraFlow GGUF support (#10463)
* Add support for loading AuraFlow models from GGUF
https://huggingface.co/city96/AuraFlow-v0.3-gguf
* Update AuraFlow documentation for GGUF, add GGUF tests and model detection.
* Address code review comments.
* Remove unused config.
---------
Co-authored-by: hlky <hlky@hlky.ac>
