[EKS] [Request]: Graduate IAMIdentityMapping to general availability

[sftim]

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Tell us about your request
Graduate IAMIdentityMapping to general availability

Which service(s) is this request for?
EKS

Tell us about the problem you're trying to solve. What are you trying to do, and why is it hard?
Declaratively define rules for mapping IAM principals to Kubernetes users and groups, using the Kubernetes API. This API is alpha so I'm wary to recommend it to customers.

Are you currently working around this issue?
Managing the aws-auth ConfigMap instead. This is a single point of co-ordination; it would be nice to set up EKS to also support IAMIdentityMappings.

Additional context
Example manifest for an IAMIdentityMapping:

https://github.com/kubernetes-sigs/aws-iam-authenticator/blob/master/deploy/example-iamidentitymapping.yaml

[blowfishpro]

Possibly related/equivalent to #550 ?

[mikestef9]

Closing as duplicate of #550