add hetznernetworking provider

[likt0r]

Add Hetzner Networking DNS Provider

Overview

Adds support for the new Hetzner Cloud DNS API with the hetznernetworking provider. This is a separate provider from the existing hetzner provider, offering modern RRSet-based operations and wildcard domain support.

Features

• Wildcard domain support (*.example.com)
• Bearer token authentication
• RRSet-based API operations
• IPv4/IPv6 support
• Configurable TTL

Configuration

{
  "settings": [
    {
      "provider": "hetznernetworking",
      "zone_identifier": "example.com",
      "domain": "sub.example.com",
      "token": "your-api-token",
      "ttl": 600,
      "ip_version": "ipv4"
    }
  ]
}

API Endpoints

• GET /v1/zones/{zone}/rrsets/{name}/{type} - Get records
• POST /v1/zones/{zone}/rrsets/{name}/{type}/actions/add_records - Create records
• POST /v1/zones/{zone}/rrsets/{name}/{type}/actions/set_records - Update records

Testing

• Compiles without errors
• Wildcard domains working
• API integration verified

Breaking Changes

None - purely additive change. Legacy hetzner provider remains unchanged.

Documentation

• Added docs/hetznernetworking.md
• References: Hetzner Cloud DNS API

[JarodSch]

Can someone merge this?