Fix cropImage crash with float displaySize

Summary:
On Android, using `ImageEditor.cropImage` with `displaySize` option may causes crash with exception below:

```
FATAL EXCEPTION: mqt_native_modules
                                                   Process: me.sohobloo.test, PID: 11308
                                                   com.facebook.react.bridge.UnexpectedNativeTypeException: TypeError: expected dynamic type `int64', but had type `double'
                                                       at com.facebook.react.bridge.ReadableNativeMap.getInt(Native Method)
                                                       at com.facebook.react.modules.camera.ImageEditingManager.cropImage(ImageEditingManager.java:196)
                                                       at java.lang.reflect.Method.invoke(Native Method)
                                                       at java.lang.reflect.Method.invoke(Method.java:372)
                                                       at com.facebook.react.bridge.BaseJavaModule$JavaMethod.invoke(BaseJavaModule.java:345)
                                                       at com.facebook.react.cxxbridge.JavaModuleWrapper.invoke(JavaModuleWrapper.java:141)
                                                       at com.facebook.react.bridge.queue.NativeRunnable.run(Native Method)
                                                       at android.os.Handler.handleCallback(Handler.java:815)
                                                       at android.os.Handler.dispatchMessage(Handler.java:104)
                                                       at com.facebook.react.bridge.queue.MessageQueueThreadHandler.dispatchMessage(MessageQueueThreadHandler.java:31)
                                                       at android.os.Looper.loop(Looper.java:194)
                                                       at com.facebook.react.bridge.queue.MessageQueueThreadImpl$3.run(MessageQueueThreadImpl.java:196)
                                                       at java.lang.Thread.run(Thread.java:818)
```

This is caused by getInt from `number` type of JS.

```javascript
      ImageEditor.cropImage(
        uri,
        {
          offset: {x: 0, y: 0},
          size: {width: 320, height: 240},
          displaySize: {width: 320.5, height: 240.5}
        }
      );
```
Closes facebook/react-native#13312

Differential Revision: D5462709

Pulled By: shergin

fbshipit-source-id: 42cb853b533769b6969b8ac9ad50f3dd3c764055

Author: sohobloo

ImageEditingManager.java

@@ -193,7 +193,9 @@ public void cropImage(
         error);
     if (options.hasKey("displaySize")) {
       ReadableMap targetSize = options.getMap("displaySize");
-      cropTask.setTargetSize(targetSize.getInt("width"), targetSize.getInt("height"));
+      cropTask.setTargetSize(
+        (int) targetSize.getDouble("width"),
+        (int) targetSize.getDouble("height"));
     }
     cropTask.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
   }