[Core] Add Ascend Quant Config to main branch

[Angazenn]

This pr adds Ascend Quant Config to main branch of vllm_asscend. It enables vllm && vllm_ascend to load and parse quantized weights from msmodelslim. It includes AscendQuantConfig class which inherits from vllm QuantizationConfig class, AscendLinearMethod class which inherits from vllm LinearMethodBase class, AscendQuantizer class that dispatches corresponding quanzation methods.