⚡ Fix the size of tuples of empty objects

Problem:
- A tuple containing distinct empty objects requires at least 1 byte for each, when it
  could be 1 byte total.

Solution:
- Apply `[[no_unique_address]]` to tuple elements so that a tuple of empty
  objects is minimal.

Author: elbeno

include/stdx/tuple.hpp

@@ -102,7 +102,7 @@ template <std::size_t Index, typename T, typename... Ts> struct element {
         return std::forward<T>(value);
     }
 
-    T value;
+    [[no_unique_address]] T value;
 
   private:
     [[nodiscard]] friend auto operator==(element const &x, element const &y)