chore: restructure Linker and Unlinker for system testing

src/Linking/Linker.h

@@ -0,0 +1,21 @@
+#pragma once
+
+#include "LinkerArgs.h"
+
+#include <memory>
+
+class Linker
+{
+public:
+    virtual ~Linker() = default;
+
+    static std::unique_ptr<Linker> Create(LinkerArgs args);
+
+    /**
+     * \brief Starts the Linker application logic.
+     * \param argc The amount of command line arguments specified.
+     * \param argv The command line arguments.
+     * \return \c true if the application was successful or \c false if an error occurred.
+     */
+    virtual bool Start() = 0;
+};