replace thread with ros , In the code related to ros

[aliakbarhamzeh1378]

Describe the bug The codes, which are written for Ros, use both Ros(Publisher and Subscriber), and Thread. the get image data from ROS Subscriber and send it to thread and wait for receive result from thread and publish to a topic. In this section, I think you added a useless step. One of the benefits of Ros is the convenience of multitasking. it not better, feed data to the model in ros-server-example.py and publish result with a custom message in a topic?