feat: More robust k8s manifest parsing

[laurentluce]

• Support for service with no deployment e.g. load balancer service (ingress).
• Support for unordered service / deployment pairs. Name matching uses the metadata label app string or the metadata name.

Example of manifest supported:

apiVersion: v1
kind: Service
metadata:
  labels:
    app: redis-prod
    version: v1
  name: redis-prod
  namespace: voting-app
  annotations:
    kardinal.dev.service/stateful: "true"
    kardinal.dev/plugins: |
      - name: github.com/kardinaldev/redis-db-sidecar-plugin:36ed9a4
        args:
          mode: "pass-through" 
spec:
  ports:
    - name: tcp-redis
      port: 6379
      protocol: TCP
      targetPort: 6379
  selector:
    app: redis-prod
---
apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    app: redis-prod
    version: v1
  name: redis-prod-v1
  namespace: voting-app
spec:
  replicas: 1
  selector:
    matchLabels:
      app: redis-prod
      version: v1
  strategy:
    rollingUpdate:
      maxSurge: 25%
      maxUnavailable: 25%
    type: RollingUpdate
  template:
    metadata:
      annotations:
        sidecar.istio.io/inject: "true"
      labels:
        app: redis-prod
        version: v1
    spec:
      containers:
        - name: redis-prod
          image: bitnami/redis:6.0.8
          env:
            - name: ALLOW_EMPTY_PASSWORD
              value: "yes"
            - name: REDIS_PORT_NUMBER
              value: "6379"
          resources:
            requests:
              cpu: 100m
              memory: 128Mi
            limits:
              cpu: 250m
              memory: 256Mi
          ports:
            - containerPort: 6379
              name: redis

---
apiVersion: v1
kind: Service
metadata:
  labels:
    app: voting-app-ui
    version: v1
  name: voting-app-ui
  namespace: voting-app
  annotations:
    kardinal.dev.service/dependencies: "redis-prod:6379"
spec:
  ports:
    - name: http
      port: 80
      protocol: TCP
      targetPort: 80
  selector:
    app: voting-app-ui
---
apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    app: voting-app-ui
    version: v1
  name: voting-app-ui-v1
  namespace: voting-app
spec:
  replicas: 1
  selector:
    matchLabels:
      app: voting-app-ui
      version: v1
  strategy:
    rollingUpdate:
      maxSurge: 25%
      maxUnavailable: 25%
    type: RollingUpdate
  template:
    metadata:
      annotations:
        sidecar.istio.io/inject: "true"
      labels:
        app: voting-app-ui
        version: v1
    spec:
      containers:
        - name: voting-app-ui
          image: kurtosistech/demo-voting-app-ui
          imagePullPolicy: IfNotPresent
          resources:
            requests:
              cpu: 100m
              memory: 128Mi
            limits:
              cpu: 250m
              memory: 256Mi
          ports:
            - containerPort: 80
          env:
            - name: REDIS
              value: "redis-prod"
---
apiVersion: v1
kind: Service
metadata:
  name: voting-app-lb
  annotations:
    kardinal.dev.service/ingress: "true"
spec:
  type: LoadBalancer
  ports:
  - port: 80
  selector:
    app: voting-app-ui