feat: Implement new reading-order model (#916)

* Implement new reading-order model, replacing DS GLM model (WIP)

Signed-off-by: Christoph Auer <cau@zurich.ibm.com>

* Update reading-order model branch

Signed-off-by: Christoph Auer <cau@zurich.ibm.com>

* Update lockfile [skip ci]

Signed-off-by: Christoph Auer <cau@zurich.ibm.com>

* Add captions, footnotes and merges [skip ci]

Signed-off-by: Christoph Auer <cau@zurich.ibm.com>

* Updates for reading-order implementation

Signed-off-by: Christoph Auer <cau@zurich.ibm.com>

* Updates for reading-order implementation

Signed-off-by: Christoph Auer <cau@zurich.ibm.com>

* Update tests and lockfile

Signed-off-by: Christoph Auer <cau@zurich.ibm.com>

* Fixes, update tests

Signed-off-by: Christoph Auer <cau@zurich.ibm.com>

* Add normalization, update tests again

Signed-off-by: Christoph Auer <cau@zurich.ibm.com>

* Update tests with code

Signed-off-by: Christoph Auer <cau@zurich.ibm.com>

* Push final lockfile

Signed-off-by: Christoph Auer <cau@zurich.ibm.com>

* sanitize text

Signed-off-by: Michele Dolfi <dol@zurich.ibm.com>

* Inlcude furniture, Update tests with furniture

Signed-off-by: Christoph Auer <cau@zurich.ibm.com>

* Fix content_layer assignment

Signed-off-by: Christoph Auer <cau@zurich.ibm.com>

* chore: Delete empty file docling/models/ds_glm_model.py

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

---------

Signed-off-by: Christoph Auer <cau@zurich.ibm.com>
Signed-off-by: Michele Dolfi <dol@zurich.ibm.com>
Signed-off-by: Nikos Livathinos <nli@zurich.ibm.com>
Co-authored-by: Michele Dolfi <dol@zurich.ibm.com>
Co-authored-by: Nikos Livathinos <nli@zurich.ibm.com>

tests/data/groundtruth/docling_v2/code_and_formula.md

@@ -4,8 +4,6 @@ Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod
 
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-Listing 1: Simple JavaScript Program
-
 ```
 function add(a, b) { return a + b; } console.log(add(3, 5));
 ```