Support to install atest as a Windows service

We already support it on the Linux platform. See also [here](https://github.com/LinuxSuRen/api-testing/blob/master/cmd/service.go).

Please feel free to read the following references below if you're interested in this issue:

* [How to Run Any Program as a Background Service in Windows](https://www.howtogeek.com/50786/using-srvstart-to-run-any-application-as-a-windows-service/)

Start by reading cmd/service.go to understand the existing Linux service support, then review the linked Windows service reference. Implement the corresponding Windows service installation support for atest and verify that the tool can be installed and run as a Windows service.

Written by the indexing model from the issue text.