List firewall rules

Example response

{
  "firewall_rules": {
    "firewall_rule": [
      {
        "action": "accept",
        "comment": "Allow SSH from the office network",
        "destination_address_end": "",
        "destination_address_start": "",
        "destination_port_end": "22",
        "destination_port_start": "22",
        "direction": "in",
        "family": "IPv4",
        "icmp_type": "",
        "position": "1",
        "protocol": "tcp",
        "source_address_end": "192.0.2.255",
        "source_address_start": "192.0.2.1",
        "source_port_end": "",
        "source_port_start": ""
      }
    ]
  }
}