Add an example of ECS canary for Service Discovery

examples/ecs/servicediscovery/canary/app.pipecd.yaml

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+apiVersion: pipecd.dev/v1beta1
+kind: ECSApp
+spec:
+  name: servicediscovery-canary
+  labels:
+    env: example
+    team: xyz
+  input:
+    serviceDefinitionFile: servicedef.yaml
+    taskDefinitionFile: taskdef.yaml
+    # When you use ECS Service Discovery for interservice networking, you must specify 'SERVICE_DISCOVERY' for 'accessType'.
+    accessType: SERVICE_DISCOVERY 
+    # 'targetGroups' is not used in Service Discovery type.
+  pipeline:
+    stages:
+      # Rollout CANARY variant's workload.
+      # scale represents the percentage of workload will be rolled out,
+      # in this case 30% of the current PRIMARY variant's workload is set.
+      # Note: Rolled out variant DOES serve traffic at this time unlike the ELB type.
+      - name: ECS_CANARY_ROLLOUT
+        with:
+          scale: 100
+      # Hold the deployment process for 150 seconds.
+      - name: WAIT
+        with:
+          duration: 150s
+      # Update the workload of PRIMARY variant to the new version.
+      # NOTE: The new PRIMARY variant will serve 100% of the traffic at this time.
+      - name: ECS_PRIMARY_ROLLOUT
+      # Destroy all workloads of CANARY variant.
+      - name: ECS_CANARY_CLEAN

examples/ecs/servicediscovery/canary/servicedef.yaml

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+cluster: arn:aws:ecs:ap-northeast-1:XXXX:cluster/test-cluster
+serviceName: nginx-canary-service
+desiredCount: 2
+deploymentConfiguration:
+  maximumPercent: 200
+  minimumHealthyPercent: 0
+schedulingStrategy: REPLICA
+# CAUTION: To enable PipeCD controls the deployment
+# DeploymentController of type EXTERNAL is required.
+deploymentController:
+  type: EXTERNAL
+enableECSManagedTags: true
+propagateTags: SERVICE
+launchType: FARGATE
+networkConfiguration:
+  awsvpcConfiguration:
+    assignPublicIp: ENABLED
+    securityGroups:
+      - sg-YYYY
+    subnets:
+      - subnet-YYYY
+      - subnet-YYYY
+# Service Discovery Config.
+serviceRegistries:
+  # You need to specify the service id of the service discovery namespace.
+  - registryArn: arn:aws:servicediscovery:ap-northeast-1:XXXX:service/srv-XXXXX 

examples/ecs/servicediscovery/canary/taskdef.yaml

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+family: nginx-service-fam
+executionRoleArn: arn:aws:iam::XXXX:role/ecsTaskExecutionRole
+containerDefinitions:
+  - command: null
+    cpu: 100
+    image: XXXX.dkr.ecr.ap-northeast-1.amazonaws.com/nginx:1
+    memory: 100
+    mountPoints: []
+    name: web
+    portMappings:
+      - containerPort: 80
+compatibilities:
+  - FARGATE
+requiresCompatibilities:
+  - FARGATE
+networkMode: awsvpc
+memory: 512
+cpu: 256
+pidMode: ""
+volumes: []