Add initial support for ingesting visual content

[vkrd]

Motivation and Context

This change allows the data_preparation.py script to upload individual images (.png, .jpg, etc.) as well as images within PDFs (figures, charts, etc.).

Description

This PR has two main parts.

1. Support for individual images - A caption is generated from a vision-enabled model and used to index the image.
2. Support for images in PDFs - Azure Document Intelligence identifies images, which are then extracted and uploaded.

Contribution Checklist

• I have built and tested the code locally and in a deployed app
• For frontend changes, I have pulled the latest code from main, built the frontend, and committed all static files.
  • N/A
• This is a change for all users of this app. No code or asset is specific to my use case or my organization.
• I didn't break any existing functionality 😄

[vkrd]

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