add datasource for aws eks describe-addon-versions

[awoimbee]

Relates to: #1385 (comment)

Is your request related to a problem? Please describe.

I manage kubernetes clusters, some deployments like kube-proxy are (strangely) not managed by EKS by default.
Like, come on ! I got informed of the issue by AlertManager !

Turns out Terraform has aws_eks_addon, but I need to give this resource addon_version, which I don't want to do, I just want the addon version to match the kubernetes version.

Describe the solution you'd like.

A datasource called something like aws_describe_addon_versions so I don't have to call the aws cli (aws eks describe-addon-versions --addon-name kube-proxy --query 'addons[*].addonVersions[0].addonVersion').
And / or I would like the ability to set addon_version = "latest" in aws_eks_addon.

Describe alternatives you've considered.

Call the aws cli (aws eks describe-addon-versions --addon-name kube-proxy --query 'addons[*].addonVersions[0].addonVersion')

EDIT: I'm so sorry, I didn't see I was on terraform-aws-modules/terraform-aws-eks and not hashicorp/terraform-provider-aws, I guess this issue is still relevant to this project, but feel free to close.

[bryantbiggs]

Requires upstream provider support hashicorp/terraform-provider-aws#20725

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[bryantbiggs]

This is a breaking change due to requiring the v4.x of the AWS provider and is scheduled for the v19.x release https://github.com/terraform-aws-modules/terraform-aws-eks/compare/master...bryantbiggs:refactor/incorporate-autoscaling-module?expand=1

[antonbabenko]

This issue has been resolved in version 19.0.0 🎉

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