Add AWS EKS Terraform module

[mweiden]

Summary

• add Terraform module to deploy cass on AWS EKS using S3 storage
• document Terraform deployment option

Testing

• cargo test
• terraform -chdir=terraform/modules/cass-eks init -backend=false (fails: Error accessing remote module registry)

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https://chatgpt.com/codex/tasks/task_e_68b676f1dc6483249dc3e91c052b6ce6

[chatgpt-codex-connector]

Codex Review: Here are some suggestions.

https://github.com/mweiden/cass/blob/0f34e44e1f2922f57105f72a8af03791f45236ab/terraform/modules/cass-eks/main.tf#L26-L25
[P1] Use expected subnet_ids argument for EKS module

The EKS module call passes subnets = var.subnet_ids, but the upstream terraform-aws-modules/eks/aws module (v20+) exposes the input as subnet_ids. Terraform will fail the plan with Unsupported argument "subnets" before any resources are created, so the module as written cannot be applied.

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