This pull request introduces the `net-vpc-factory` module. This new factory handles:
* Project setup (most of what's supported by the `project` module)
* VPC setup
* Routing
* Subnets
* Connectivity options
* NCC (hub, VPC spokes and VPN hybrid spokes)
* Peerings
* VPN (GCP-to-onprem and GCP-to-GCP)
* NAT (everything supported by the `net-cloudnat` module)
* DNS (everything supported by the `dns` module)
* Firewall (everything supported by the `net-vpc-firewall` module)
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