get_virtual_machine_scale_set_network_interface

Hi,

Could you please add a module to get info on a network interface for a VM Scale Set?
As `azure_rm_networkinterface_info `does for VM.

Use Case: retrieve Private address IPs for VMSS instances.

Class `network_interfaces`, Method [get_virtual_machine_scale_set_network_interface()](https://docs.microsoft.com/fr-fr/python/api/azure-mgmt-network/azure.mgmt.network.v2019_12_01.operations.networkinterfacesoperations?view=azure-python#get-virtual-machine-scale-set-network-interface-resource-group-name--virtual-machine-scale-set-name--virtualmachine-index--network-interface-name--expand-none--custom-headers-none--raw-false----operation-config-)