service: refactor server architecture

Converts services to have their own processes

src/core/core.h

@@ -61,6 +61,8 @@ namespace Glue {
 class ARPManager;
 }
 
+class ServerManager;
+
 namespace SM {
 class ServiceManager;
 } // namespace SM
@@ -417,6 +419,9 @@ public:
     /// Tells if the system debugger is enabled.
     [[nodiscard]] bool DebuggerEnabled() const;
 
+    /// Runs a server instance until shutdown.
+    void RunServer(std::unique_ptr<Service::ServerManager>&& server_manager);
+
     /// Type used for the frontend to designate a callback for System to re-launch the application
     /// using a specified program index.
     using ExecuteProgramCallback = std::function<void(std::size_t)>;