feat: Allow subset to split routing in CVAT to HF exporter

[cau-git]

Example to run the script:

uv run python -m docling_eval.campaign_tools.cvat_deliveries_to_hf \
  /path/to/submission_dirs/ \
  /path/to/huggingface_dataset_export/ \
  --export-kind ground_truth \
  --split default --subset-split pdf_val=validation --subset-split pdf_test=test --subset-split 'pdf_train_*'=train \
  --chunk-size 200 --datasets-root /path/to/base_cvat_dataset/

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[PeterStaar-IBM]

Can we please add some documentation. I have the feeling your comment will get lost.