Support kubernetes configuration using core mode

[lnattrass]

Description

From the documentation:

core (Boolean) Configure direct access using Kubernetes API server.
this feature works by starting a local ArgoCD API server that talks directly to the Kubernetes API using the current context in the default kubeconfig (~/.kube/config). This behavior cannot be overridden using either environment variables or the kubernetes block in the provider configuration at present).

It would be good to be able to supply a Kubernetes configuration to the ArgoCD core instance when using core mode

Potential Terraform Configuration

provider "argocd" {
  core = true
  kubernetes {
    host                   = aws_eks_cluster.this.endpoint
    cluster_ca_certificate = base64decode(aws_eks_cluster.this.certificate_authority[0].data)
    exec {
      api_version = "client.authentication.k8s.io/v1beta1"
      command     = "aws-iam-authenticator"
      args        = concat("token", "-i", aws_eks_cluster.this.name)
    }
  }

References

#268

(I searched, but, sorry if this is a dupe!)

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