Reagent listener

Binds to a network interface and accepts incomіng tcp connections, producing reagents `tcp as a vаlues.

Syntax: reagent[`listener;"host:port"]

listener: reagent[`listener;"0.0.0.0:5100"];

spawn {
    react {[x:listener]
        cli: reagent[`ipc;x];
        react {[x:cli] println["\nclient  request: [%] -- %";ts[];x]; cli[x]}
    };
};