[autoscaling.AutoScalingGroup] need protectFromScaleIn option

[yuichiro12]

Hi. I found aws.autoscaling.GroupArgs has much more options than awsx.autoscaling.AutoScalingGroupArgs such as protectFromScaleIn.

I'm not happy about using raw aws.autoscaling.Group because I create AutoScalingGroup with ECS Cluster like this:

const cluster = new awsx.ecs.Cluster(...)
const asg = cluster.createAutoScalingGroup(...) // => awsx.autoscaling.AutoScalingGroup