✅ Test DAP Server

[DRovara]

What's the problem this feature will solve?

Currently, the package has no tests for the DAP server, and the dap submodule is ignored by codecov. Changes to the structure of the Debugging backend could easily break the DAP server, and manually testing it can be cumbersome.

It would be great to have automated tests in the CI pipeline. However, to test the DAP Server, we practically need a semi-functional DAP client, which can be quite some work to implement.

Describe the solution you'd like

The perfect solution would be a pytest file that uses a fixture that sets up the communication between a DAP server instance and a client. In different test cases, the client would send typical messages to the server, and the test cases would check whether the returned responses are correct or not.