[new]修改部分view的ad_id为String类型

lib/src/widget/flutter_banner_ad_view.dart

@@ -6,7 +6,7 @@ import '../constants/flutter_method.dart';
 import '../constants/view_type.dart';
 
 class FlutterBannerAdView extends StatefulWidget {
-  final int androidAdId;
+  final String androidAdId;
   final String iosAdId;
   final BannerAdListener? listener;
 

lib/src/widget/flutter_native_ad_view.dart

@@ -7,7 +7,7 @@ import '../constants/view_type.dart';
 import '../listener/native_ad_listener.dart';
 
 class FlutterNativeAdView extends StatefulWidget {
-  final int androidAdId;
+  final String androidAdId;
   final String iosAdId;
   final NativeAdListener? listener;