chore: Introduce common directory to deduplicate shared code

src/utils/scope_exit.h

@@ -1,13 +0,0 @@
-#pragma once
-#include <functional>
-
-// https://stackoverflow.com/a/61242721
-template<typename F>
-struct scope_exit
-{
-    F func;
-    explicit scope_exit(F&& f): func(std::forward<F>(f)) {}
-    ~scope_exit() { func(); }
-};
-
-template<typename F> scope_exit(F&& frv) -> scope_exit<F>;