Feat: Support uploading pdfs

[PiyushMishra318]

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[sweep-ai]

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• Apply: All new business logic should have corresponding unit tests.
• Apply: Refactor large functions to be more modular.
• Apply: Add docstrings to all functions and file headers.

[PiyushMishra318]

@abi I wanted to discuss how you want to handle the UI for showing multiple images and the response for each image. If you want it separately or just in different sections in the same HTML.

[abi]

@PiyushMishra318 just the same HTML

[PiyushMishra318]

@abi I've added a reference for how the response looks like when given multiple images.

Let me know if you have some input on this. I'll start working on the pdf input once I get your confirmation.