AK: Add operator delete stub to all AK_MAKE_ETERNAL objects

Static analysis correctly flags that we are missing an implementation
for `operator delete` for all classes which are annotated with
AK_MAKE_ETERNAL. To appease static analysis define an implementation
which asserts to make sure no one ever calls delete on the object.

AK/kmalloc.h

@@ -42,6 +42,7 @@ inline size_t malloc_good_size(size_t size) { return size; }
 #    define AK_MAKE_ETERNAL                                               \
     public:                                                               \
         void* operator new(size_t size) { return kmalloc_eternal(size); } \
+        void operator delete(void*, size_t) { VERIFY_NOT_REACHED(); }     \
                                                                           \
     private:
 #else