* add quantization codebase for resnet, shufflenetv1, and mobilenetv2
Co-authored-by: NKevin.W <xsw200831720@gmail.com>
Co-authored-by: Nwangshupeng <wangshupeng@megvii.com>
Co-authored-by: LiZhiyuan <848796515@qq.com>
Co-authored-by: Nwangjianfeng <wangjianfeng@megvii.com>