* added marker task files

* added marker basic functionalities

* modified pyproject.toml for marker

* added table converter

* added tests for marker

* changes following comments at the marker.py and pyproject.toml

* fixed test_marker

* Update sieves/tasks/preprocessing/marker.py

Co-authored-by: Raphael Mitsch <r.mitsch@outlook.com>

* moved pre commit dependency to test, alphabetical order in preprocessing init file

* Update sieves/tasks/preprocessing/marker.py

Co-authored-by: Raphael Mitsch <r.mitsch@outlook.com>

* added image field to doc, modified  marker task adding extracted images to the doc field

* fixed tests updating with the images in the doc object

* fixed tests updating the version

* changed sieves version in test to 0.8

* modified the doc object to check fo image equality

* changed the doc.py check images method - added docstrings, handled none cases

* improved docstring for image equality checks

* added tests for doc file

* added ignore marker in marker test file, return type in docstring in doc file

* added docs pages, added marker to docs te4st file

---------

Co-authored-by: Angelo Di Gianvito <angelo@Mac.homenet.telecomitalia.it>
Co-authored-by: Angelo Di Gianvito <angelo@Angelos-MacBook-Pro.local>
Co-authored-by: Angelo Di Gianvito <angelo@Mac.fritz.box>
Co-authored-by: Raphael Mitsch <r.mitsch@outlook.com>