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/analytics-firebase/index.ts

@@ -60,7 +60,9 @@ import { Cordova, CordovaProperty, IonicNativePlugin, Plugin } from '@ionic-nati
   repo: 'https://github.com/appfeel/analytics-google',
   platforms: ['Android', 'iOS']
 })
-@Injectable()
+@Injectable({
+  providedIn: 'root'
+})
 export class AnalyticsFirebase extends IonicNativePlugin {
   /**
    * This enum represents AnalyticsFirebase default events.