0.2.0 Fix value of 'count' cannot be computed errors

what

• Fix value of 'count' cannot be computed errors

why

• Some resources from terraform-aws-eks-cluster depended on terraform-aws-eks-workers, while some resources from terraform-aws-eks-workers depended on terraform-aws-eks-cluster, producing cyclical dependencies and errors "value of 'count' cannot be computed"
• Decoupled the depended resources

references

• https://docs.cloudposse.com/faq/terraform-value-of-count-cannot-be-computed/
• https://www.terraform.io/docs/providers/aws/guides/eks-getting-started.html#preparation
• https://www.terraform.io/docs/providers/aws/guides/eks-getting-started.html#configuring-kubectl-for-eks
• https://www.terraform.io/docs/providers/aws/guides/eks-getting-started.html#required-kubernetes-configuration-to-join-worker-nodes