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Add automatic HTTPS/SVCB hinting support to PowerDNS provider #4187

@alinnow

Description

@alinnow

Is your feature request related to a problem? Please describe.
I cannot use PowerDNS-supported HTTPS/SVCB automatic hinting via dnscontrol as dnscontrol throws a validation error:

 HTTPS('foo', 1, '.', 'alpn=h3,h2 ipv4hint=auto ipv6hint=auto')
2026/04/03 13:41:37 could not parse SVCB record: dns: : "ipv4hint=auto" at line: 1:49

Describe the solution you'd like
The record should pass validation, or I should be able to disable validation for this case (less ideal).

Describe alternatives you've considered
Restructuring my entire configuration to store per-host data in a JSON object and manually template the ipv{4,6}hint= parameters.

Additional context
Provider feature documentation: https://doc.powerdns.com/authoritative/guides/svcb.html#automatic-hints

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