Allow service-based CPU/memory statistics

[sitole]

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Tell us about your request Right now App Runner allows us to show only per-instance CPU and memory statistics. But for better context (we have multiple instances running in same time) i want to see per-service CPU and memory statistics in CloudWatch. So i can create Alarms etc. For example same as ECS services. Maximal, avg and minimal CPU/memory in some point of time.