Add JCS Autoscaling Policy

[scross01]

Add support for an Java Cloud Service Auto Scaling Policy resource. The policy defines rules and conditions for when to automatically scale the service instance.

https://docs.oracle.com/en/cloud/paas/java-cloud/jsrmr/api-automatic-scaling.html

E.g. potential target configuration

resource "oraclepaas_java_service_autoscaling_policy" "example" {
   service_instance = "${oraclepaas_java_service_instance.example.name}"
   name = "my-auto-scale-policy"
   policy {
      operation = "scaleOut"
      alarm {
          metric_name = "CPUUtilization"
          metric_unit = "percent"
          statistic = "AVG"
          comparison_operator = "GreaterThanOrEqualToThreshold"
          threshold = 80
          sample_count = 3
          sample_frequency = 10
          breached_on_instance = "ALL"
      }
      cool_down_period = 30
      max_cluster_size = 4
  }
}