The relative future provided by any plugin call is not getting completed.

## Description: 
- The relative future provided by any plugin call is not getting completed. 

## Steps to reproduce: 
```dart
Future<void> triggerCTAEvent() async {
  await WebEngagePlugin.trackEvent('Added to Cart', {
    "CTA": "add_to_cart",
  });

  log('Pushed CTA event to analytics');
}

triggerCTAEvent(); // It won't print the log-in console. 

```

## How it can be fixed: 
- The plugin is not calling `success` or `error`. 
```java
private void setUserListAttribute(MethodCall call, Result result) {
    String attributeName = call.argument(ATTRIBUTE_NAME);
    List<? extends Object> attributes = call.argument(ATTRIBUTES);
    WebEngage.get().user().setAttribute(attributeName, attributes);
}
```
- After the call of WebEngage, call the `success` or `error`  method relatively at the end of the callback. 
- example: 
```java
private void setUserListAttribute(MethodCall call, Result result) {
    String attributeName = call.argument(ATTRIBUTE_NAME);
    List<? extends Object> attributes = call.argument(ATTRIBUTES);
    WebEngage.get().user().setAttribute(attributeName, attributes);
    result.success(null);  // <-- Add this line at the end of all call from the flutter or dart side 
}
```

- Now from the flutter side: 
```dart
triggerCTAEvent(); // It will log this: `Pushed CTA event to analytics`. 
```


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The relative future provided by any plugin call is not getting completed. #35

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The relative future provided by any plugin call is not getting completed. #35

Description

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