feat: option to link vnets with private DNS zones

[matt-FFFFFF]

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Description

Provide a list of private DNS zone resource IDs that we link to the vnets.

Provide a link to a private DNS resolver ruleset

Describe the solution you'd like

Additional context

[kamilzzz]

This is something I have been thinking about as a good addition to the existing module capability.

We are using Private DNS Resolver deployed centrally in the hub together with DNS Forwarding Rulesets.

When deploying subscription landing zones for specific applications/workloads I would like to be able to link DNS Forwarding Rulesets to spoke VNETs using this module.

[jtracey93]

@kamilzzz good thinking. I raised this to @matt-FFFFFF when we were discussing this earlier this week. We said we would do it :)