feat(android): expose REQUEST_LAUNCH codes (react-native-image-picker#1713)

This allows android users to natively handle selected media for processing

Author: Kenneth Schnall

android/src/main/java/com/imagepicker/ImagePickerModule.java

@@ -23,9 +23,10 @@
 public class ImagePickerModule extends ReactContextBaseJavaModule implements ActivityEventListener {
     static final String NAME = "ImagePickerManager";
 
-    static final int REQUEST_LAUNCH_IMAGE_CAPTURE = 13001;
-    static final int REQUEST_LAUNCH_VIDEO_CAPTURE = 13002;
-    static final int REQUEST_LAUNCH_LIBRARY = 13003;
+    // Public to let consuming apps hook into the image picker response
+    public static final int REQUEST_LAUNCH_IMAGE_CAPTURE = 13001;
+    public static final int REQUEST_LAUNCH_VIDEO_CAPTURE = 13002;
+    public static final int REQUEST_LAUNCH_LIBRARY = 13003;
 
     private Uri fileUri;