List firewalls

{
    "success": true,
    "firewalls": [
        {
            "id": "12345",
            "name": "production-firewall",
            "description": "Production environment firewall",
            "region": "CANADA-1",
            "environment": {
                "id": "env-123",
                "name": "prod-environment",
                "region": "CANADA-1"
            },
            "rules": [
                {
                    "id": "rule-1",
                    "direction": "ingress",
                    "protocol": "tcp",
                    "ethertype": "IPv4",
                    "remote_ip_prefix": "0.0.0.0/0",
                    "port_range_min": 443,
                    "port_range_max": 443
                }
            ],
            "attachments": [
                {
                    "vm": {
                        "id": "vm-123",
                        "name": "web-server-01",
                        "status": "RUNNING"
                    }
                }
            ]
        }
    ],
    "tier": "legacy",
    "request_id": "a1b2c3d4"
}