lookup static method
Connect to an IsolatedAudioHandler from another isolate having the name
portName
(defaulting to defaultPortName).
Implementation
static Future<AudioHandler> lookup(
{String portName = defaultPortName}) async {
assert(!kIsWeb, "Isolates are not supported on web");
final handler = _ClientIsolatedAudioHandler(portName: portName);
await handler._init();
return handler;
}