Add Language Model Decoder

Closes #142 (closed)

Taking over from !222 (closed)

dan/datasets/extract/extract.py

@@ -28,7 +28,7 @@ from dan.datasets.extract.utils import (
     download_image,
     insert_token,
     normalize_linebreaks,
-    normalize_spaces
+    normalize_spaces,
 )
 from dan.utils import LM_MAPPING, EntityType, parse_tokens
 from line_image_extractor.extractor import extract, read_img, save_img