WIP: support using pre-trained weights

[leej3]

I have a couple of bugs to work through, from the ignite repo

docker run ... -v $PWD:/workspace/ignite pytorchignite/vision:latest /bin/bash
# and inside
pip install fire pycocotools
pip install ultralytics --no-dependencies
cd ignite/examples/object_detection
python main.py train --dataset=coco128 --data_path=coco128 --output_path=output --batch_size=64 --model=yolov8n-coco --with-clearml --num-workers=8 --num-epochs 200 --use-pt-weights