Method init

example/E01-AutoPilot.cpp:102–105

class CarDetectorGNode : public GNode {
public:
    CStatus init() override {
        conn_id_ = CGRAPH_BIND_MESSAGE_TOPIC(ImageMParam, EXAMPLE_IMAGE_TOPIC, DEFAULT_MESSAGE_BUF_SIZE)
        return CStatus();
    }

    CStatus run() override {
        std::shared_ptr<ImageMParam> image = nullptr;