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/star-prnt/index.ts

@@ -648,7 +648,9 @@ export interface CommandsArray extends Array<PrintCommand> {}
   repo: 'https://github.com/auctifera-josed/starprnt', // the github repository URL for the plugin
   platforms: ['Android', 'iOS'] // Array of platforms supported, example: ['Android', 'iOS']
 })
-@Injectable()
+@Injectable({
+  providedIn: 'root'
+})
 export class StarPRNT extends IonicNativePlugin {
   /**
    * Constant for Emulation