Nmstate based networking

This MR introduces a new pillar key (nmstate) that allows for customizable network management. The nmstate pillar key can be used to configure networking settings such as interface states, IP addresses, and routing.

The updated services-hypervisor.sls file includes the new nmstate pillar and configures it to manage the network state. This MR also updates the nmstate.sls file to generate a managed nmstate configuration file based on the pillar settings.