feat: adding support for creating targets from ExternalName

[msvticket]

Issue

#3505

Description

I added support for ip target groups when service is of type ExternalName.

I have not updated any documentation, but I'm happy to do that in case you want the code change to begin with.

Checklist

• [x] Added tests that cover your change (if possible)
• [ ] Added/modified documentation as required (such as the README.md, or the docs directory)
• [x] Manually tested
• [x] Made sure the title of the PR is a good description that can go into the release notes

BONUS POINTS checklist: complete for good vibes and maybe prizes?! :exploding_head:

• [ ] Backfilled missing tests for code in same general area :tada:
• [ ] Refactored something and made the world a better place :star2:

[k8s-ci-robot]

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[k8s-ci-robot]

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[k8s-ci-robot]

Hi @msvticket. Thanks for your PR.

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[msvticket]

Could you have a look at this @oliviassss ?

[Leen15]

any update on this?

[MateuszWkDev]

I woul like to get update on this as this seems much needed functionality in order to support certain usecases

[Reyalsorik]

Any update? I would appreciate this functionality.

[nousot-cloud-guy]

Is there anything that's holding up this PR that someone could help finish? This would be really useful functionality to have.