Add isSuccessful() method to Response

[OndraM]

For simple check whether all contained command responses were successful.

This is also recommended way how to validate response successfulness.

If you don't need to process response (eg. when submitting events to Matej) you can now for example simply do this:

public function submitDataToMatej(/*...*/): bool
    $response = $matej->request()
        ...
        ->send();
    
    // All commands were successful
    if ($response->isSuccessful()) {
        return true;
    }
    
    // At least one was not successful, so we log those
    foreach ($response->getCommandResponses() as $commandResponse) {
        if (!$commandResponse->isSuccessful()) {
            $this->logger->log('Command to Matej failed: ' . $commandResponse);
        }
    }
    
    return false;
}