AK: Add AK_MAKE_DEFAULT_COPYABLE

Author: https://github.com/DanShaders
Commit: 855ea192be
Pull-request: https://github.com/SerenityOS/serenity/pull/21661
Reviewed-by: https://github.com/ADKaster
Reviewed-by: https://github.com/alimpfard
Reviewed-by: https://github.com/kleinesfilmroellchen
Reviewed-by: https://github.com/trflynn89

AK/Noncopyable.h

@@ -20,3 +20,8 @@ private:                      \
 public:                            \
     c(c&&) = default;              \
     c& operator=(c&&) = default
+
+#define AK_MAKE_DEFAULT_COPYABLE(c) \
+public:                             \
+    c(c const&) = default;          \
+    c& operator=(c const&) = default