Refactor array to avoid having to include external types

codegen/array/snippets/extend_alloc

@@ -7,7 +7,7 @@
   u64 remaining_capacity = array->capacity - array->count;
   if (other->count >= remaining_capacity) {{
     u64 new_capacity = wapp_misc_utils_u64_round_up_pow2(array->capacity * 2);
-    output           = wapp_{Tlower}_array_alloc_capacity(allocator, new_capacity);
+    output           = ({ArrayType} *)_array_alloc_capacity(allocator, new_capacity, array->item_size);
     if (!output) {{
       output = array;
       goto RETURN_{Tupper}_ARRAY_EXTEND_ALLOC;