Add error handler for transactional event

[hyh1016]

Exceptions propagated from the transactional event listener are handled by TransactionSynchronizationUtils and are not rethrown.
However, the lack of a configurable error handler for these exceptions makes it difficult to customize exception handling during transactional event processing.
To address this, I added an abstract error handler that can be defined as follows:

@Component
public abstract class TransactionalEventErrorHandlerImpl extends TransactionalEventErrorHandler {

	// can inject other beans

	@Override
	public void handle(ApplicationEvent event, @Nullable Throwable ex) {
		// custom logic
	}

}

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