AWS SignatureV4 implementing for userver::s3api #1053
Description
userver::s3api currentlyimplements the aws V2 signature, which is deprecated and causes issues when working with new s3 storages that work with V4.
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userver::s3api currentlyimplements the aws V2 signature, which is deprecated and causes issues when working with new s3 storages that work with V4.