fix(cloudflare): regional hostnames

[vflaux]

Description

Implements the creation & deletion of Cloudflare regional hostnames for A, AAAA & CNAME records when --cloudflare-region-key is set or external-dns.alpha.kubernetes.io/cloudflare-region-key annotation is set.

Fixes #5174

Checklist

• Unit tests updated
• End user documentation updated

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: vflaux (c3f0cd6, 6f65181)

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[mloiseleur]

/retitle fix(cloudflare): regional hostnames

[mloiseleur]

/ok-to-test

[mloiseleur]

@AndrewCharlesHay Do you think you can review this PR ?

[vflaux]

This implementation attempts to infer the state of regional hostnames on Cloudflare based on received changes, then self-corrects using API error responses (e.g., Not Found or Conflict errors).
Another approach could be to query the API to list all regional hostnames in the zone before making changes.
The api is not paginated and I'm concerned by the potential performances with a lot of hostames, but I may be overthinking this.

[AndrewCharlesHay]

This implementation attempts to infer the state of regional hostnames on Cloudflare based on received changes, then self-corrects using API error responses (e.g., Not Found or Conflict errors). Another approach could be to query the API to list all regional hostnames in the zone before making changes. The api is not paginated and I'm concerned by the potential performances with a lot of hostames, but I may be overthinking this.

I think the way you have it is good

[AndrewCharlesHay]

LGTM

[mloiseleur]

/approve
/lgtm

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mloiseleur

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[mloiseleur]

@vflaux You just need to rebase on top of #5268 and the test should go green

[mloiseleur]

/lgtm