refactor: optimize plugins for angular treeshaking

BREAKING CHANGE: You can remove the plugin import from the app.module.ts because of the changed Inject decorator

src/@ionic-native/plugins/android-full-screen/index.ts

@@ -55,7 +55,9 @@ export enum AndroidSystemUiFlags {
   repo: 'https://github.com/mesmotronic/cordova-plugin-fullscreen',
   platforms: ['Android']
 })
-@Injectable()
+@Injectable({
+  providedIn: 'root'
+})
 export class AndroidFullScreen extends IonicNativePlugin {
   /**
    * Is this plugin supported?