feat: Unstructured elements splitting example

[simjak]

Example of how we can use a Rolling window splitter with Unstructured library.

• Partition file using Unstructured
• Group elements by title (Exclude invalid titles)
• Create chunks from Unstructured elements using the semantic splitter
• Visualize the text

Example notebook:
docs/examples/unstructured-element-splitter.ipynb

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.33%. Comparing base (4feb431) to head (6b6fbaf).

Additional details and impacted files

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  Coverage   78.33%   78.33%           
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  Files          41       41           
  Lines        1943     1943           
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  Hits         1522     1522           
  Misses        421      421           

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[jamescalam]

great work @simjak :)