This class specifies a port range for a firewall rule. It can be used in the src_port and dst_port parameters of a rule. For example: src_port=PortRange(2000, 2100), or src_port=(PortRange(2000, 2100), PortRange(2500, 2600)). When listing multiple elements, ports and port ranges can be mixed, for example: src_port=(4433, PortRange(2000, 2100), PortRange(2500, 2600))