Function async_timer

async_timer(
    params: {
        interval: number;
        name: string;
        rx_handler: CProtocolEventHandler<CTimerEvent>;
    },
): CTimerProtocol
Create an asynchronous timer set on a specified interval. When the event is fired, the rx_handler will receive the event.
Parameters
- params: {
      interval: number;
      name: string;
      rx_handler: CProtocolEventHandler<CTimerEvent>;
  }
  The named parameters
  - interval: number
    
    The interval the timer protocol will fire a CTimerEvent.
  - name: string
    
    Identification for the protocol.
  - rx_handler: CProtocolEventHandler<CTimerEvent>
    
    The receive handler for processing the event.
Returns CTimerProtocol
Example
```
// Create a timer protocol that fires on a given interval
let timer = async_timer({
  name: "timer",
  interval: 250, // 250 millisecond interval
  rx_handler: (evt) => {
    // Handle timer firing events.
  }
});

// Later when done.
timer.terminate();
```