Refactor the serializer module

[y9luiz]

Refactor the serializer module would involve 3 milestones:

1. Create a Serializable interface
2. Implements the methods to serialize and deserialize to all necessary classes

3. For OpenCV classes create a new class that gonna encapsulate it. Eg.:

   class Image : public Serializable
   {
     public:
     //...
      // (whatever we have here)
     //...
   
    cv::Mat m_image;
   }

4. Make the Serializer receives only Serializable objects

[y9luiz]

I refactored the code and created the Serializable interface, but I'm still using the OpenCV class. I will replace it in the future.

You can check the changes at: https://github.com/y9luiz/FaceRecognitionServer/pull/29