feat(vector): Allow configuration of service port overrides via vector.portsOverrides

[bderrly]

This template is meant for those users that want the automatically generated port definitions in the Service manifests but also needs to make some overrides, or additions, to those definitions.

Example changes:

values.yaml

service:
  portsOverrides:
    - name: vector
      appProtocol: grpc

customConfig:
  api:
    enabled: true
    address: 127.0.0.1:8686
  sources:
    vector:
      address: 0.0.0.0:6000
      type: vector

results in a Service like the following:

kind: Service
clusterIP: None
ports:
  - appProtocol: grpc
    name: vector
    port: 6000
    protocol: TCP
    targetPort: 6000
  - name: api
    port: 8686
    protocol: TCP
    targetPort: 8686
selector:
  app.kubernetes.io/name: vector
  app.kubernetes.io/instance: release-name
  app.kubernetes.io/component: Aggregator
type: ClusterIP