S3: Pre-signed Download URLs

[mbergkvist]

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Tell us about your request
Presigned urls for AWS S3 Upload

Tell us about the problem you're trying to solve. What are you trying to do, and why is it hard?
Generate a pre-signed URL for an Amazon S3 objects to give users temporary access to objects.

Additional context
https://awscli.amazonaws.com/v2/documentation/api/latest/reference/s3/presign.html
#139

[jdisanti]

Tracking this in #139 since the pre-sign functionality will be implemented generically across all services and operations.