1.0.0-alpha.19

1. Fixed methodQueue missing in Linking module metadata
2. Use @rigor789/resolve-package-path to resolve
   package path for modules that give error ERR_PACKAGE_PATH_NOT_EXPORTED
3. Added Alert module so you can now do import { Alert } from "react-native & use it.
4. Added getConstants method to native module
5. Fixed class extraction regex to only extract class declaration that is public on android
6. Extract module name from @ReactModule annotation when possible because modules for new arch might not have the getName method defined on android
7. Skip source files that do not have a module exported
8. Added support to auto-link CoreModules on iOS