@Override
    protected AmazonApiGatewayV2Async build(AwsAsyncClientParams params) {
        return new AmazonApiGatewayV2AsyncClient(params);
    }
Construct an asynchronous implementation of AmazonApiGatewayV2Async using the current builder configuration.

@param params
       Current builder configuration represented as a parameter object.
@return Fully configured implementation of AmazonApiGatewayV2Async.
aws-java-sdk-apigatewayv2/src/main/java/com/amazonaws/services/apigatewayv2/AmazonApiGatewayV2AsyncClientBuilder.java