Add annotations templating for service

[ilyas1uphealth]

Primarily to support Load Balancer annotations in AWS, which are defined here. https://kubernetes-sigs.github.io/aws-load-balancer-controller/v2.2/guide/ingress/annotations/

Here are some examples, from within the charts/trino directory:

helm template . -f values.yaml | grep "kind: Service" -A 20 -B 3

---
# Source: trino/templates/service.yaml
apiVersion: v1
kind: Service
metadata:
  name: release-name-trino
  namespace: default
  labels:
    app: trino
    chart: trino-0.19.0
    release: release-name
    heritage: Helm
spec:
  type: ClusterIP
  ports:
    - port: 8080
      targetPort: http
      protocol: TCP
      name: http
  selector:
    app: trino
    release: release-name
    component: coordinator
---

And with some annotations set:

helm template . -f values.yaml --set service.annotations.foo=boo --set service.annotations.bar=baz | grep "kind: Service" -A 23 -B 3 

---
# Source: trino/templates/service.yaml
apiVersion: v1
kind: Service
metadata:
  name: release-name-trino
  namespace: default
  labels:
    app: trino
    chart: trino-0.19.0
    release: release-name
    heritage: Helm
  annotations:
    bar: baz
    foo: boo
spec:
  type: ClusterIP
  ports:
    - port: 8080
      targetPort: http
      protocol: TCP
      name: http
  selector:
    app: trino
    release: release-name
    component: coordinator
---

In practice this would be combined with type: LoadBalancer, but the addition of annotations does not itself require this use case so it would be unnecessary to restrict it.

[cla-bot[bot]]

Thank you for your pull request and welcome to our community. We could not parse the GitHub identity of the following contributors: Ilyas Aricanli. This is most likely caused by a git client misconfiguration; please make sure to:

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[cla-bot[bot]]

Thank you for your pull request and welcome to our community. We could not parse the GitHub identity of the following contributors: Ilyas Aricanli. This is most likely caused by a git client misconfiguration; please make sure to:

1. check if your git client is configured with an email to sign commits git config --list | grep email
2. If not, set it up using git config --global user.email email@example.com
3. Make sure that the git commit email is configured in your GitHub account settings, see https://github.com/settings/emails

[cla-bot[bot]]

Thank you for your pull request and welcome to our community. We could not parse the GitHub identity of the following contributors: Ilyas Aricanli. This is most likely caused by a git client misconfiguration; please make sure to:

1. check if your git client is configured with an email to sign commits git config --list | grep email
2. If not, set it up using git config --global user.email email@example.com
3. Make sure that the git commit email is configured in your GitHub account settings, see https://github.com/settings/emails

[ilyas1uphealth]

It seems upset with me, I'm going to close this, figure out the email details, and re-open later