feat(validated-dto): support Cast attribute for DTOCast type (#958)

This change improves the handling of Cast attributes in SimpleDTO by treating DTOCast similarly to EnumCast - both now pass the class name directly as a parameter instead of instantiating it.

Changes:
- Updated SimpleDTO.php to handle DTOCast in the match expression alongside EnumCast
- Modified CallableCastingDTOInstance test to use Cast attribute instead of manual casts() method
- Ensures consistency in how different cast types are handled

This refactor simplifies the code and allows Cast attributes to work correctly with DTOCast type.

Co-authored-by: Deeka Wong <8337659+huangdijia@users.noreply.github.com>

Author: huangdijia

src/SimpleDTO.php

@@ -20,6 +20,7 @@
 use FriendsOfHyperf\ValidatedDTO\Attributes\Rules;
 use FriendsOfHyperf\ValidatedDTO\Casting\ArrayCast;
 use FriendsOfHyperf\ValidatedDTO\Casting\Castable;
+use FriendsOfHyperf\ValidatedDTO\Casting\DTOCast;
 use FriendsOfHyperf\ValidatedDTO\Casting\EnumCast;
 use FriendsOfHyperf\ValidatedDTO\Concerns\DataResolver;
 use FriendsOfHyperf\ValidatedDTO\Concerns\DataTransformer;
@@ -324,9 +325,10 @@ protected function buildCasts(): array
                 continue;
             }
 
-            $param = $cast->type === EnumCast::class
-                ? $cast->param
-                : new $cast->param();
+            $param = match (true) {
+                in_array($cast->type, [EnumCast::class, DTOCast::class]) => $cast->param,
+                default => new $cast->param(),
+            };
 
             $casts[$property] = new $cast->type($param);
         }