feat: add target annotation for service

[eburghar]

Description

This pull request add the possibility to override the target of service the way we can do with ingress. It allows for example to publish an IP for a service when the load balancer is natted.

apiVersion: v1
kind: Service
metadata:
  annotations:
    external-dns.alpha.kubernetes.io/hostname: imap.example.com,pop3.example.com,smtp.example.com
    external-dns.alpha.kubernetes.io/target: X.X.X.X
spec:
  ports:
    - port: 25
      name: smtp
    - port: 143
      name: imap
    - port: 110
      name: imap
  selector:
    app: mail
  type: LoadBalancer

Fixes #2240

Checklist

• Unit tests updated
• End user documentation updated

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[APPROVALNOTIFIER] This PR is NOT APPROVED

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[KlavsKlavsen]

I would really like this too..

[Danielss89]

Yeah, +1 for this one :)

[eburghar]

If someone can take this PR over as I'm not able to complete CLA Authorization as the project does not allow individual contributions (only corporate).

Regards.

[mariusmarais]

@eburghar Not sure what you mean, the CLA document says to select which type of contributor you are? Is there a problem with the CLA process for you?

[eburghar]

Yes apparently I can only sign on behalf of an organization.

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/lifecycle rotten

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/close

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@k8s-triage-robot: Closed this PR.

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/close

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[GMartinez-Sisti]

@eburghar I can take this over if you are able to re-open.

[eburghar]

@GMartinez-Sisti I didn't close it but sure feel free to reopen a PR based on this one.