InitListener 1.3.1 API

```
public interface InitListener

                    
```
Listener for SDK initialization events.
Implement this interface to be notified of initialization completion or errors. This is useful for:
- Measuring SDK impact on app startup time
- Handling initialization failures gracefully
- Logging SDK performance metrics
SAM interface: consumers can pass a lambda for onError, e.g. listener = { error -> ... }.

Method Summary

Modifier and Type	Method	Description
`abstract Unit`	`onError(Throwable t)`	Called when SDK initialization encounters a critical error.
`Unit`	`onInitialized(Long mainThreadDurationMs, Long totalDurationMs)`	Called when SDK initialization completes successfully.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Method Detail
  - onError
```
 abstract Unit onError(Throwable t)
```
    Called when SDK initialization encounters a critical error. The SDK will be disabled after this callback.
  - onInitialized
```
 Unit onInitialized(Long mainThreadDurationMs, Long totalDurationMs)
```
    Called when SDK initialization completes successfully.
    
    Parameters:
    
    mainThreadDurationMs - Time spent on the main thread during configure() (goal: <10ms)
    
    totalDurationMs - Total time from configure() call to full initialization