feat: Rich tables for MSWord backend (#2291)

* Adding support of rich table cells to MSWord backend

Signed-off-by: Maksym Lysak <mly@zurich.ibm.com>

* Fixes for properly accounting lists, pictures and headers in rich table cells

Signed-off-by: Maksym Lysak <mly@zurich.ibm.com>

* Cleaned up msword backend, re-generated docx tests

Signed-off-by: Maksym Lysak <mly@zurich.ibm.com>

* Added detection of simple table cells in word backend

Signed-off-by: Maksym Lysak <mly@zurich.ibm.com>

* Cleaned up

Signed-off-by: Maksym Lysak <mly@zurich.ibm.com>

---------

Signed-off-by: Maksym Lysak <mly@zurich.ibm.com>
Co-authored-by: Maksym Lysak <mly@zurich.ibm.com>

tests/data/groundtruth/docling_v2/test_emf_docx.docx.json

@@ -1,6 +1,6 @@
 {
   "schema_name": "DoclingDocument",
-  "version": "1.6.0",
+  "version": "1.7.0",
   "name": "test_emf_docx",
   "origin": {
     "mimetype": "application/vnd.openxmlformats-officedocument.wordprocessingml.document",
@@ -52,7 +52,7 @@
       },
       "children": [],
       "content_layer": "body",
-      "label": "paragraph",
+      "label": "text",
       "prov": [],
       "orig": "Test with three images in unusual formats",
       "text": "Test with three images in unusual formats",
@@ -71,7 +71,7 @@
       },
       "children": [],
       "content_layer": "body",
-      "label": "paragraph",
+      "label": "text",
       "prov": [],
       "orig": "Raster in emf:",
       "text": "Raster in emf:",
@@ -90,7 +90,7 @@
       },
       "children": [],
       "content_layer": "body",
-      "label": "paragraph",
+      "label": "text",
       "prov": [],
       "orig": "Vector in emf:",
       "text": "Vector in emf:",
@@ -109,7 +109,7 @@
       },
       "children": [],
       "content_layer": "body",
-      "label": "paragraph",
+      "label": "text",
       "prov": [],
       "orig": "Raster in webp:",
       "text": "Raster in webp:",