Farmer support for network interface

This PR closes #

The changes in this PR are as follows:

Adding support for azure network interface
Support both dynamic and static ip allocation

I have read the contributing guidelines and have completed the following:

[x] Tested my code end-to-end against a live Azure subscription.
[x] Updated the documentation in the docs folder for the affected changes.
[x] Written unit tests against the modified code that I have made.
[x] Updated the release notes with a new entry for this PR.
[x] Checked the coding standards outlined in the contributions guide and ensured my code adheres to them.

If I haven't completed any of the tasks above, I include the reasons why here:

Below is a minimal example configuration that includes the new features, which can be used to deploy to Azure:

#r "nuget:Farmer"
open Farmer
open Farmer.Builders
open Farmer.Builders.NetworkInterface

arm {
    location Location.EastUS
    add_resources
        [
            vnet {
                name "test-vnet"
                add_address_spaces [ "10.0.0.0/16" ]
            }
            networkInterface {
                name "my-network-interface"
                subnet_prefix "10.0.100.0/24"
                link_to_vnet (virtualNetworks.resourceId "test-vnet")
                add_static_ip "10.0.100.10"
                accelerated_networking_flag false
                ip_forwarding_flag false
            }
        ]
}

CompositionalIT / farmer

Farmer support for network interface #1039