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Adds ICMP API for ping. tcpip.js already supported ICMP echo replies implicitly via lwIP's built-in behaviour, but we didn't expose any outbound ping APIs. This adds a
createPingSession()API on theNetworkStackinstance which allows you to ping a host. The point of the ping session (over just aping()method) is to provide a stable ICMP identifier + auto incrementing sequence numbers every time you callsession.ping().