[ecs] Add CapacityProvider CRD and capacityProviderStrategy field support

[blackdog0403]

Is your feature request related to a problem?

The ACK ECS controller currently supports Cluster, Service, and TaskDefinition CRDs, but does not support CapacityProvider as a CRD. Additionally, the Service CRD does not expose the capacityProviderStrategy field, and the Cluster CRD does not support capacityProviders or defaultCapacityProviderStrategy.

Data platforms (Spark, Kafka, etc.) running on ECS use CapacityProviders to dynamically scale compute resources (ASG-based EC2 or Fargate) based on workload demands. Without ACK support, teams cannot manage this critical infrastructure entirely through Kubernetes manifests, breaking the fully declarative GitOps workflow.

Describe the solution you'd like

We need:

1. A CapacityProvider CRD to create and manage capacity providers
2. capacityProviderStrategy field support in the Service CRD
3. capacityProviders and defaultCapacityProviderStrategy support in the Cluster CRD

Expected CRD behavior:

apiVersion: ecs.services.k8s.aws/v1alpha1
kind: CapacityProvider
metadata:
  name: spark-compute-cp
spec:
  name: spark-compute-cp
  autoScalingGroupProvider:
    autoScalingGroupARN: arn:aws:autoscaling:us-west-2:123456789012:autoScalingGroup:...
    managedScaling:
      status: ENABLED
      targetCapacity: 80
      minimumScalingStepSize: 1
      maximumScalingStepSize: 10
    managedTerminationProtection: ENABLED

apiVersion: ecs.services.k8s.aws/v1alpha1
kind: Service
metadata:
  name: spark-job-service
spec:
  name: spark-job-service
  clusterName: data-platform-cluster
  taskDefinition: spark-job-taskdef
  desiredCount: 10
  capacityProviderStrategy:
    - capacityProvider: spark-compute-cp
      weight: 1
      base: 5

Describe alternatives you've considered

Currently managing CapacityProviders via Terraform or AWS CLI outside of ACK, which breaks the single-source-of-truth model for infrastructure managed through Kubernetes.

AWS API References:

• CreateCapacityProvider
• PutClusterCapacityProviders
• CreateService — capacityProviderStrategy parameter

[github-actions]

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[jlbutler]

Thanks for the issue @blackdog0403. Do you have any interest in / need for managedInstancesProvider, or is that a secondary concern? I'll look at including it, but it is a pretty complex nested structure - might be easier to leave that for followup.