🐛 Replace single - subscription stream in _channel creation with broadcast stream

[pye52]

Due to _channel = _socket!.cast<String>(), the _channel will be assigned to CloseGuaranteeChannel. Inside the listen method of CloseGuaranteeChannel, there is a line of code:

var subscription = _inner.listen(onData,
        onError: onError, onDone: onDone, cancelOnError: cancelOnError);

When this _inner.listen method is called multiple times, it will also throw the Bad state: Stream has already been listened to error.

[quetool]

Hello @pye52! Your mentioned issue has already been fixed by @AlexV525 with this PR #67 which should already been included in reown_core: 1.1.1

Can you check it and comment your thoughts if needed?