feat: Adding MDocument as first class citizen

[PeterStaar-IBM]

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[mergify]

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[HendrikStrobelt]

@PeterStaar-IBM should this replace https://github.com/generative-computing/mellea/blob/main/mellea/stdlib/docs/richdocument.py in the future ?

[PeterStaar-IBM]

@PeterStaar-IBM should this replace https://github.com/generative-computing/mellea/blob/main/mellea/stdlib/docs/richdocument.py in the future ?

yes, I am trying something out and need your and Nathan's opinion. Let's have a quick chat in Boston

[nrfulton]

@PeterStaar-IBM Is this still draft or ready for review/merge?

[PeterStaar-IBM]

@PeterStaar-IBM Is this still draft or ready for review/merge?

I am wiating to finalise these two PR's, which will be the ones to add right functionality,

1. feat: add metadata model hierarchy docling-project/docling-core#408
2. feat: add summary field and serializer docling-project/docling-core#389
3. feat: make an experimental outline serializer docling-project/docling-core#415