Allow using IAM roles to setup log streaming to s3

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Proposal

We allow log streaming to s3, but we require the use of access keys. Some customers have internal policies that require the use of IAM roles instead. But with the current implementation, the use of IAM roles is not an option.

We write to the S3 buckets through access keys using the ruby AWS S3 SDK. Using IAM with an AWS SDK is possible:https://docs.aws.amazon.com/IAM/latest/UserGuide/sdk-general-information-section.html, so we should consider adding it to the options.