awsutil/v2.0.0

This major version release utilizes the latest version of the aws-sdk-go-v2. The following behavioral changes are included in this release:

• Custom endpoint resolvers are attached to the STS and IAM clients, not to the credentials. This is apart of the aws-sdk-go-v2 EndpointResolverV2 feature.
• withStsEndpoint is no longer a string type, but a sts.EndpointResolverV2 type. This option was relabeled to withStsEndpointResolver.
• withIamEndpoint is no longer a string type, but a iam.EndpointResolverV2 type. This option was relabeled to withIamEndpointResolver.
• By default, aws credential configurations will load values from environment variables. The user provided options will overload the default values.
• The ability to mock out the underlying credential provider for unit testing.

Changed behaviors from awsutil v0 includes the following:

• Replaced aws errors with aws smithy-go errors
• No longer able to utilize the aws default remote credential provider
• The function GenerateCredentialChain returns a aws.Config, which contains the credential provider.