Adding Label Filters in Hybrid Chunking

### Requested feature
I just started using Docling and I really like the results of the Hybrid Chunking mechanism (with merge_peers enabled) as it is able to effectively capture content that is separated across pages. However, I think it would be really useful if the chunking mechanism would have an additional parameter for ignoring specific texts like the page_footers and page_headers (this is currently captured and labelled as such by the models) while merging the content. I am attaching a screenshot of actual text and its parsed chunk for better clarity. Moreover, I am also adding an image showing the corresponding footer and header texts in the DoclingDocument.



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### Alternatives
I tried implementing this on my own by playing with the base Docling Document that was returned but I thought it would be a good feature to have as it would enable people to ignore repetitive content within a document.
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