bug when using ng add

### Version info

**Angular: 16.0.0**

**AngularFire: 16.0.0**

**ionic: 7.5.0**

The problem is that all imports are on a single line without a comma, and the options must be in a file enviroment.ts

`importProvidersFrom(provideFirebaseApp(() => initializeApp({ "projectId": "products-management-24d37", "appId": "1:297477400518:web:2e921bbcd4faaee5edf4c7", "storageBucket": "products-management-24d37.appspot.com", "apiKey": "AIzaSyBq8PkHk8YahCbve3DiOtXFDmhhabrzTy4", "authDomain": "products-management-24d37.firebaseapp.com", "messagingSenderId": "297477400518", "measurementId": "G-151GNJXTSH" })))importProvidersFrom(provideAuth(() => getAuth()))importProvidersFrom(provideFirestore(() => getFirestore()))importProvidersFrom(provideStorage(() => getStorage())),`

首先使用 Angular 16.0.0、AngularFire 16.0.0 和 Ionic 7.5.0 重现 ng add 流程，重点关注报告中提到的生成的 provider imports 和 environment.ts 配置。当生成的 imports 以逗号正确分隔，并且 Firebase 选项放置在 environment.ts 中时，即表示完成。

由索引模型根据 Issue 内容生成。