How do I set subnet delegation within the hub networks?

[djbark]

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Description

Is your feature request related to a problem?

I want to deploy a DNS Private Resolver within the hub networks, but to do so two new subnets are required with subnet delegation set to dnsResolvers.

Describe the solution you'd like

The ability to set subnet delegation in settings.connectivity.tf, or documentation on how to do that if it is already possible.

Additional context