[Feature request] Add source_address_prefixes & destination_address_prefixes to azurestack_network_security_rule

[zhicaigian]

Hi all,

I've been using terraform for azurestack and noticed that even though the Azure Portal allows specifying rule with multiple addresses delimited by commas, the current terraform provider for azurestack doesn't have the following argument references:
source_address_prefixes
destination_address_prefixes

This means to create a rule with multiple source address, you have to split the rules into multiple rules. The terraform provider for azurerm have the above argument references. Please implement them for azurestack. Thank you!

argument references taken from: https://registry.terraform.io/providers/hashicorp/azurestack/latest/docs/resources/network_security_rule