fix: avoid using getClipboardFiles() if unsupported on the current platform

Author: EchoEllet

lib/src/editor_toolbar_controller_shared/clipboard/default_clipboard_service.dart

@@ -48,6 +48,10 @@ class DefaultClipboardService extends ClipboardService {
   }
 
   Future<String?> _getClipboardFile({required String fileExtension}) async {
+    if (!(await QuillNativeBridge.isSupported(
+        QuillNativeBridgeFeature.getClipboardFiles))) {
+      return null;
+    }
     if (kIsWeb) {
       // TODO: Can't read file with dart:io on the Web (See related https://github.com/FlutterQuill/quill-native-bridge/issues/6)
       return null;