Refactor: Extract common code from LaunchRequestHandler's delegate

See ILaunchDelegate.java#L25-L27

    CompletableFuture<Response> launchInTerminal(LaunchArguments launchArguments, Response response, IDebugAdapterContext context);

    CompletableFuture<Response> launchInternally(LaunchArguments launchArguments, Response response, IDebugAdapterContext context);

There is common logic in implementation for both interfaces. The main differences in implementation for debug/noDebug are:

• launchInTerminal: It constructs different command string, and then take different actions according to response.
• launchInternally: It starts debuggee process in different ways.

Refactor work should be done to make code clean and readable.

Empieza por ILaunchDelegate.java en las líneas 25-27 y, después, inspecciona las implementaciones de launchInTerminal y launchInternally en el delegado de LaunchRequestHandler. Compara la lógica compartida y las diferencias de debug/noDebug descritas en el issue; se considera terminado cuando el comportamiento común esté consolidado y el delegado siga siendo legible sin cambiar esos distintos comportamientos de lanzamiento.