R2-2800: Document aws-sdk-s3 rust crate for R2

[helloimalastair]

Summary

Document support for aws-sdk-s3 in R2 SDK Docs.

Documentation checklist

• The documentation style guide has been adhered to.
• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.

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PR Change Summary

Documented support for the aws-sdk-s3 Rust crate in R2 SDK documentation, providing examples for basic usage, uploading, downloading, and generating presigned URLs.

• Added a new example page for aws-sdk-s3 integration with R2.
• Included code snippets for basic usage, uploading, and downloading objects.
• Provided instructions for generating presigned URLs for temporary access.

Added Files

• src/content/docs/r2/examples/aws/aws-sdk-rust.mdx

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