Minimal working version of the training code

.pre-commit-config.yaml

Datasets/dataset_formatters/extract_from_arkindex.py

...ets/dataset_formatters/extraction_utils/arkindex_utils.py

Datasets/dataset_formatters/extraction_utils/utils.py

Datasets/dataset_formatters/generic_dataset_formatter.py

Datasets/dataset_formatters/simara_formatter.py

OCR/document_OCR/dan/main_dan.py

OCR/ocr_dataset_manager.py

basic/metric_manager.py

dan/decoder.py

dan/models.py

dan/ocr_utils.py

dan/post_processing.py

dan/predict.py