[Enhancement]: Add tags to TargetTracking alarms created by aws_appautoscaling_policy

Description

Can we add a tags input to the aws_appautoscaling_policy and apply those tags to the target tracking alarms that get created?

CloudWatch TargetTracking alarms created by the aws_appautoscaling_policy resource don't have tags and I don't see an argument to add them in the resource. Tags added using default_tags in the aws provider block don't get added to the alarms either. It seems like this should be possible because "alarm_arns" is one of the attributes exported by the resource.

Affected Resource(s) and/or Data Source(s)

aws_appautoscaling_policy

Potential Terraform Configuration

resource "aws_appautoscaling_target" "ecs_target" {
  max_capacity       = 4
  min_capacity       = 1
  resource_id        = "service/clusterName/serviceName"
  scalable_dimension = "ecs:service:DesiredCount"
  service_namespace  = "ecs"
}

resource "aws_appautoscaling_policy" "example" {
  name               = "foo"
  policy_type        = "TargetTrackingScaling"
  resource_id        = aws_appautoscaling_target.ecs_target.resource_id
  scalable_dimension = aws_appautoscaling_target.ecs_target.scalable_dimension
  service_namespace  = aws_appautoscaling_target.ecs_target.service_namespace

  tags {
    mytag = "value"
  }

  target_tracking_scaling_policy_configuration {
    target_value = 100

    customized_metric_specification {
      metrics {
        label = "Get the queue size (the number of messages waiting to be processed)"
        id    = "m1"

        metric_stat {
          metric {
            metric_name = "ApproximateNumberOfMessagesVisible"
            namespace   = "AWS/SQS"

            dimensions {
              name  = "QueueName"
              value = "my-queue"
            }
          }

          stat = "Sum"
        }

        return_data = false
      }

      metrics {
        label = "Get the ECS running task count (the number of currently running tasks)"
        id    = "m2"

        metric_stat {
          metric {
            metric_name = "RunningTaskCount"
            namespace   = "ECS/ContainerInsights"

            dimensions {
              name  = "ClusterName"
              value = "default"
            }

            dimensions {
              name  = "ServiceName"
              value = "web-app"
            }
          }

          stat = "Average"
        }

        return_data = false
      }

      metrics {
        label       = "Calculate the backlog per instance"
        id          = "e1"
        expression  = "m1 / m2"
        return_data = true
      }
    }
  }
}

References

No response

hashicorp / terraform-provider-aws