Is your feature request related to a problem? Please describe.
After configuring IPv6 prefix delegation successfully, the interfaces that are assigned a prefix do not configure an address for the delegated prefix. This makes configuring DHCPv6 via dnsmasq or similar challenging, as they need an interface address to construct their ranges from.

Describe the solution you'd like
Expose a boolean flag to automatically add an address from the delegated prefix to the interface. It should respect the IPv6Token parameter.

Describe alternatives you've considered
Running a script to set these addresses manually before bringing dnsmasq up.