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.

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[mloiseleur]

/retitle fix(cloudflare): regional hostnames