chore: re-export DocumentStream explicitly for type checkers (#3181)

fix: re-export DocumentStream explicitly for type checkers (PEP 484)

Fixes #3165

Signed-off-by: Eugenio-BAYE <baye.eugenio.egnb@gmail.com>

Author: Eugenio-BAYE

docling/datamodel/base_models.py

@@ -13,7 +13,9 @@
 )
 from docling_core.types.doc.base import PydanticSerCtxKey, round_pydantic_float
 from docling_core.types.doc.page import SegmentedPdfPage, TextCell
-from docling_core.types.io import DocumentStream
+from docling_core.types.io import (
+    DocumentStream as DocumentStream,
+)
 
 # DO NOT REMOVE; explicitly exposed from this location
 from PIL.Image import Image