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/music-controls/index.ts

@@ -151,7 +151,9 @@ export interface MusicControlsOptions {
   repo: 'https://github.com/homerours/cordova-music-controls-plugin',
   platforms: ['Android', 'iOS', 'Windows']
 })
-@Injectable()
+@Injectable({
+  providedIn: 'root'
+})
 export class MusicControls extends IonicNativePlugin {
   /**
    * Create the media controls