Add support for optional `pod_identity_association` for `aws_eks_addon`

[cazlo]

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What is the outcome that you are trying to reach?

Use AWS CloudWatch Observability addon using EKS Pod Identity pattern, instead of IRSA.
See also https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/install-CloudWatch-Observability-EKS-addon.html#install-CloudWatch-Observability-EKS-pod-identity

Describe the solution you would like

A dynamic block to manage the pod_identity_association for each aws_eks_addon

See also
https://github.com/terraform-aws-modules/terraform-aws-eks/blob/82acedc0593723979dc653d726617884cf7ab447/main.tf#L773-L780

Describe alternatives you have considered

None

Additional context

https://docs.aws.amazon.com/eks/latest/userguide/pod-identities.html

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