feat: Add F5 TransportServer source

[visokoo]

Description

Should completely fix: #2739 by adding in the TransportServer CRD as well. This is basically an exact copy of this PR from 2 yrs ago, but adds the TransportServer instead. We can use the same code because the TransportServer is essentially the same thing as the VirtualServer, but it accepts other ports other than 80 and 443.

Checklist

• Unit tests updated
• Docs updated

[k8s-ci-robot]

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[k8s-ci-robot]

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[visokoo]

@mloiseleur just want to make sure it's on your radar. It's adding a new source.

[mloiseleur]

@visokoo Thanks for this PR. Would you please complete current documentation about F5 sources with this new source, and show how it works from user point of view ?

[mloiseleur]

/ok-to-test

[visokoo]

Added docs @mloiseleur, thank you for reviewing!

[mloiseleur]

The code lgtm.
Would you please provide a (simple) example of this CR with external dns annotation in the tutorial ?
This can help newcomers. It has already been done in Traefik or Istio tutorial.