feat: Add DoclingParseV3 backend using high-level docling-parse API

[cau-git]

Note: This is experimental and will change throughout future iterations.

Checklist:

• [ ] Documentation has been updated, if necessary.
• [ ] Examples have been added, if necessary.
• [ ] Tests have been added, if necessary.

[mergify[bot]]

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[cau-git]

TODO

• [x] Put DoclingParseV1DocumentBackend back, mark as deprecated
• [x] Correct handling of BoundingRectangle.to_bounding_box() when text cells are rotated, instead of fixing it in get_text_cells.
• [x] Add pipeline options to control if we want to populate the page.parsed_page in ConversionResult.

[maxmnemonic]

LGTM!