Add support for GraalVM native image

**Is your feature request related to a problem? Please describe.**
Notifications are not sent when run as a native image.
I was able to use the library after adding reflection configuration for these classes:
Message.class,
Notification.class,
AndroidConfig.class,
AndroidNotification.class,
AndroidFcmOptions.class,
WebpushConfig.class,
WebpushFcmOptions.class,
WebpushNotification.class,
ApnsConfig.class,
ApnsFcmOptions.class,
ApsAlert.class,
FcmOptions.class,
MessagingServiceResponse.class,
MessagingServiceErrorResponse.class

**Describe the solution you'd like**
Add reflect-config.json file to the project

**Describe alternatives you've considered**
Document how to achieve native image compatibility