Add DocumentUrl and support document via BinaryContent

[Kludex]

There are two model families that understand documents:

• Anthropic
  • https://docs.anthropic.com/en/docs/build-with-claude/citations
  • https://docs.anthropic.com/en/docs/build-with-claude/pdf-support
• Gemini: https://cloud.google.com/vertex-ai/generative-ai/docs/multimodal/document-understanding

The Anthropic models seems to give more insights than Gemini. We need to make decisions regarding the API given that.

The current implementation by the time I wrote this is not enough - it didn't include context, nor cache_control, nor citations from Anthropic.

[github-actions]

Docs Preview

commit:	1ff69e3
Preview URL:	https://ca30ae74-pydantic-ai-previews.pydantic.workers.dev

[hyperlint-ai]

PR Change Summary

Enhanced document input capabilities by introducing support for DocumentUrl and BinaryContent, along with clarifications on model compatibility and usage.

• Added support for document input via DocumentUrl and BinaryContent.
• Updated documentation to clarify model compatibility with document inputs.
• Included warnings regarding binary data handling in Gemini models.

Modified Files

• docs/input.md

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