Feat/enrich page number to partitions

[lunmatu101]

Motivation and Context (Why the change? What's the scenario?)

• Include page number information in Text Partition.

High level description (Approach, Design)

• Implement by the simple way
  • Reuse ExtractedContent from GeneratedFileDetails.
  • Create chunks based on ExtractedContent instead of ExtractedText, to reference the page number.
• This way can keep page number info in a simple way but can lead to unoptimized chunks' size.

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