Customer provided public IP address support in secured hubs

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### Issue Type?

Feature Request

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### Description

Azure firewall in combination with Vwan (secured hubs) supports a customer provided public IP for the firewalls:

[Customer provided public IP address support in secured hubs](https://learn.microsoft.com/en-us/azure/firewall/secured-hub-customer-public-ip?toc=%2Fazure%2Fvirtual-wan%2Ftoc.json&bc=%2Fazure%2Fvirtual-wan%2Fbreadcrumb%2Ftoc.json&tabs=powershell)

This is for example necessary for certain firewall policy rule types in which you want to route to the firewall public ip, which wouldn't be known otherwise in beforehand.