refactor(MediaGroupMessage, PollMessage): Migrate normalizers from configureOptionsResolver

- Refactored MediaGroupMessage and PollMessage classes to introduce a normalizers method.
- Replaced configureOptionsResolver method's normalizer definitions with a new normalizers method returning an array of closures.
- This change improves code organization and clarity by separating normalization logic from option configuration.

Author: guanguans

src/Telegram/Messages/MediaGroupMessage.php

@@ -62,11 +62,13 @@ public function toHttpUri(): string
         return 'bot{token}/sendMediaGroup';
     }
 
-    protected function configureOptionsResolver(OptionsResolver $optionsResolver): void
+    /**
+     * @return array<string, \Closure(OptionsResolver $optionsResolver, mixed $value): mixed>
+     */
+    protected function normalizers(): array
     {
-        $optionsResolver->setNormalizer(
-            'media',
-            static fn (OptionsResolver $_, array $media): string => json_encode($media, \JSON_THROW_ON_ERROR),
-        );
+        return [
+            'media' => static fn (OptionsResolver $_, array $media): string => json_encode($media, \JSON_THROW_ON_ERROR),
+        ];
     }
 }

src/Telegram/Messages/PollMessage.php

@@ -89,10 +89,16 @@ public function toHttpUri(): string
     protected function configureOptionsResolver(OptionsResolver $optionsResolver): void
     {
         $optionsResolver
-            ->setAllowedTypes('options', 'array')
-            ->setNormalizer(
-                'options',
-                static fn (OptionsResolver $_, array $value): string => json_encode($value, \JSON_THROW_ON_ERROR),
-            );
+            ->setAllowedTypes('options', 'array');
+    }
+
+    /**
+     * @return array<string, \Closure(OptionsResolver $optionsResolver, mixed $value): mixed>
+     */
+    protected function normalizers(): array
+    {
+        return [
+            'options' => static fn (OptionsResolver $_, array $value): string => json_encode($value, \JSON_THROW_ON_ERROR),
+        ];
     }
 }