feat:align android and iOS image's default scale type

doric-android/doric/src/main/java/pub/doric/shader/ImageNode.java

@@ -66,7 +66,9 @@ public class ImageNode extends ViewNode<ImageView> {
 
     @Override
     protected ImageView build() {
-        return new ImageView(getContext());
+        ImageView imageView =  new ImageView(getContext());
+        imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
+        return imageView;
     }
 
     @Override

doric-iOS/Pod/Classes/Shader/DoricImageNode.m

@@ -39,6 +39,7 @@ @implementation DoricImageNode
 - (UIImageView *)build {
     return [[YYAnimatedImageView new] also:^(UIImageView *it) {
         it.clipsToBounds = YES;
+        it.contentMode = UIViewContentModeScaleAspectFill;
     }];
 }