Add Kubernetes Metrics Server

[lesha1201]

We need to add ability to enable Kubernetes Metrics server if needed.

Example of the code:

data "http" "metrics_server_manifest" {
  url = "https://github.com/kubernetes-sigs/metrics-server/releases/latest/download/components.yaml"

  lifecycle {
    postcondition {
      condition     = contains([200, 201, 204], self.status_code)
      error_message = "Invalid status code for ${self.url}."
    }
  }
}

locals {
  metrics_server_resources_raw = split("\n---\n", data.http.metrics_server_manifest.response_body)
  metrics_server_resources = [
    for rawContent in local.metrics_server_resources_raw : yamldecode(rawContent)
  ]
}

resource "kubernetes_manifest" "metrics_server" {
  for_each = { for item in local.metrics_server_resources : item.metadata.name => item }

  manifest = each.value
}