how to add new camera?

[zmmhz]

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System information

• OS Platform and Distribution (e.g., Linux Ubuntu 18.04):
• Apollo installed from (source or binary):
• Apollo version (3.5, 5.0, 5.5, 6.0):
• Output of apollo.sh config if on master branch:

Steps to reproduce the issue:

• Please use bullet points and include as much details as possible:
• 在视觉检测模块中所有的默认初始化话模块都限定只能两个摄像头，如int FusionCameraDetectionComponent::InitCameraFrames()中进入就判断是否是两个摄像头，是否去除此限制就可以直接添加第三个摄像头进行测试？还需要其他修改吗？

Supporting materials (screenshots, command lines, code/script snippets):

if (camera_names_.size() != 2) { AERROR << "invalid camera_names_.size(): " << camera_names_.size(); return cyber::FAIL; }