optimize endpoints Targets struct

[dongjiang1989]

trafficstars

What would you like to be added:

 it may call ParseAddr many times for the same target.
So let's give us one more chance to avoid that. I have an other idea.

Wdyt about converting Target from a string to a struct with a string and Addr* ?
It would mean it may use Addr when it's relevant and keep string comparison when it's not an IP ?

Originally posted by @mloiseleur in https://github.com/kubernetes-sigs/external-dns/pull/4351#issuecomment-2042507179

Why is this needed:

change Targets from []string to []Target

type Target struct {
	Addr netip.Addr
	Raw  string
}
// Targets is a representation of a list of targets for an endpoint.
type Targets []Target

### Tasks
- [ ] https://github.com/kubernetes-sigs/external-dns/pull/4351
- [ ] https://github.com/kubernetes-sigs/external-dns/pull/4379

[dongjiang1989]

/cc @mloiseleur I'll add a follow-up PR to optimize it.

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/lifecycle stale

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/lifecycle rotten

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/close not-planned

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@k8s-triage-robot: Closing this issue, marking it as "Not Planned".

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The Kubernetes project currently lacks enough active contributors to adequately respond to all issues and PRs.

This bot triages issues according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
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/close not-planned

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