如题，OpenHarmony 3.2 Release如何采用Native API切换相机的前后摄像头，目前默认获取的摄像头个数为1（尽管设备存在两个摄像头）, 代码片段如下：

```

    sptr<CameraManager> camManagerObj = CameraManager::GetInstance();
    camManagerObj->SetCallback(std::make_shared<TestCameraMngerCallback>(testName));
    std::vector<sptr<CameraDevice>> cameraObjList = camManagerObj->GetSupportedCameras();

    LOGI("Camera ID count: %lu\n", cameraObjList.size());

    for (auto info : cameraObjList) {
        LOGI("Camera ID: %s, position: %d, camera type: %d, connection type: %d\n", info->GetID().c_str(),
            info->GetPosition(), info->GetCameraType(), info->GetConnectionType());

    }

```