Add support for Web Identity credentials #1
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The default chain credential provider in Rusoto doesn't currently support Web Identity (needed for workloads running as pods on EKS using service accounts to obtain IAM credentials).
This pull request adds support on top of the Rusoto work to add it as a provider in the expected order (it needs to be able to get credentials from WebIdentity before the IMDS provider as the EKS worker node will have IAM creds for cluster management stuff but it still allows for the credentials to be overridden by the
AWS_ACCESS_KEY_IDetc environment variables).