Add library_name: mobilint to model card metadata

feat: add yolov3u.onnx file for model tracking with Git LFS

feat: Add best_result.json and yolov3u.mxq files for model tracking and versioning

feat: Update YOLOv3u models with new global4 and global8 variants, modify existing multi and single models, and generalize `.mxq` LFS tracking.

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