AWS-SDK V2 needed for SSO

[joekiller]

We need SSO support which only exists the V2 SDK. https://docs.aws.amazon.com/sdk-for-java/latest/developer-guide/setup.html#setup-credentials

I imagine a macro could be used to wrap the clients but idioms by which AWS clients are created both compliment and somewhat grate against amazonicas elegance. Because we need it now, we'll be porting our stuff to https://github.com/cognitect-labs/aws-api library which has v2 support and all that.