[Enhancement]: Checksum S3 uploads

[estensen]

Use case and current behavior

AWS uses checksum for uploading files, but another checksum can be added and stored as metadata to be absolutely sure that the data that was supposed to be stored is stored. It's best practice for migrations of data and while you're not doing that here it might be good to have some extra protection.

Enhancement

Checksums can be specified on s3.PutObjectInput

Solution proposal

Either use SHA256 as checksum or CRC32C. Since blobs are keyed by it can be used, but it's a bit less performant than CRC32C.

Additional Information

https://docs.aws.amazon.com/AmazonS3/latest/userguide/checking-object-integrity.html
https://aws.amazon.com/getting-started/hands-on/amazon-s3-with-additional-checksums/?ref=docs_gateway/amazons3/checking-object-integrity.html