[Java] FlightStream: how to check whether data is available in the stream in a nonblocking way;

### Describe the usage question you have. Please include as many useful details as possible.

as the title:
How to check whether data is available in the stream in a nonblocking way;

It seems that the FlightStream API only supports fetching data by calling the `next()` method in blocking; I think a nonblocking method like `tryNext()` should also be needed.

### Component(s)

Java

Comienza con la API Java FlightStream y su método bloqueante next(). Determina el contrato esperado para comprobar la disponibilidad de datos sin bloquear, incluido cómo se representa el final del flujo. Se considera terminado cuando los llamadores pueden comprobar la disponibilidad sin bloquear a través de la API FlightStream.

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