feat(OCR): Introduce the OcrOptions.force_full_page_ocr parameter that forces a full page OCR scanning (#290)

- When the OCR is forced, any existing PDF cells are rejected.
- Introduce the force-ocr cmd parameter in docling CLI.
- Update unit tests.
- Add the full_page_ocr.py example in mkdocs.

Signed-off-by: Nikos Livathinos <nli@zurich.ibm.com>

docling/models/easyocr_model.py

@@ -5,7 +5,7 @@ import numpy
 import torch
 from docling_core.types.doc import BoundingBox, CoordOrigin
 
-from docling.datamodel.base_models import OcrCell, Page
+from docling.datamodel.base_models import Cell, OcrCell, Page
 from docling.datamodel.document import ConversionResult
 from docling.datamodel.pipeline_options import EasyOcrOptions
 from docling.datamodel.settings import settings
@@ -88,12 +88,8 @@ class EasyOcrModel(BaseOcrModel):
                         ]
                         all_ocr_cells.extend(cells)
 
-                    ## Remove OCR cells which overlap with programmatic cells.
-                    filtered_ocr_cells = self.filter_ocr_cells(
-                        all_ocr_cells, page.cells
-                    )
-
-                    page.cells.extend(filtered_ocr_cells)
+                    # Post-process the cells
+                    page.cells = self.post_process_cells(all_ocr_cells, page.cells)
 
                 # DEBUG code:
                 if settings.debug.visualize_ocr: