[FEAT] Mock server helper

[kobenguyent]

Starts a mock server that is a simulated server that imitates the behavior of a real server. It's quite handy for testing to replicate the responses of a backend system. As an Automation QA Engineer, I sometimes need to use mock servers to test their applications without relying on the actual backend, allowing them to simulate various scenarios and ensure the frontend interacts correctly with the backend when it's eventually integrated.