CUS-393: Align Gateways serviceAccount with Consoles

[BStarmerSmith]

We had a discrepancy between Gateway and Console, where console allowed you to define annotations and also had more options for labels for your service account.

This PR brings the two product much closer in terms of linking our product to your service accounts. Adding many more values to the Gateway Helm Chart such as:

serviceAccount.annotations
serviceAccount.automountServiceAccountToken

[BStarmerSmith]

See example of me using these new values and the serviceaccount they create:

# Source: conduktor-gateway/templates/serviceaccount.yaml
apiVersion: v1
kind: ServiceAccount
metadata:
  name: Service Account 1
  namespace: "conduktor"
  labels:
    helm.sh/chart: conduktor-gateway-3.3.1
    app.kubernetes.io/name: conduktor-gateway
    app.kubernetes.io/instance: conduktor-gateway
    app.kubernetes.io/version: "3.3.1"
    app.kubernetes.io/managed-by: Helm
  annotations:
    eks.amazonaws.com/role-arn: arn:aws:iam::123456789012:role/role-name
automountServiceAccountToken: true