[Feature] Use UPnP to open ports

[kobigurk]

🚀 Feature

Motivation

snarkOS requires at least one port to be open and routed to the node PC: 4131. UPnP allows applications to programatically request the router to perform port forwarding.

Implementation

Perhaps it's possible to use libraries such as https://github.com/sbstp/rust-igd/blob/master/examples/add_port.rs to implement it.