Add support for assuming AWS IAM roles without AWS profiles #151
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This adds the support for assuming AWS IAM roles via vals ref URLs.
This is an important usability enhancement because we currently support assuming roles only by configuring AWS profiles before calling vals (and helmfile, which is a tool that integrates vals as a library).
In other words, you no longer need to configure AWS profiles to let vals assume role before reading e.g. AWS SSM Parameter Store. Instead, you just give a
role_arn
parameter in the vals ref URL query and vals assumes role for you.