[Feature]: Create an AppLauncher replacing repeated code in app examples and template

[BjoernAtBosch]

Description

The examples and the app skeleton of the vehicle-app-cpp-template contain repeated code for launching the Vehicle App. This could be replaced by a helper class provided by the SDK:

template<typename TAppClass> 
class Launcher {
public:
   Launcher() = default;
   ~Launcher() = default;

  void signalHandler() { ... }

   template<typename... TArgs>
   void launch(TArgs... args) {
      m_app = std::make_unique<TAppClass>(args...);
      signal(SIGINT, &Launcher<TAppClass>::signalHandler);
   }


private:
   std::unique_ptr<TAppClass> m_app;
}

// usage

Launcher<SeatAdjusterApp>().launch();

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Additional Context

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