Support firebase v12

`firebase` `12.0.0` was recently released:
- https://firebase.google.com/support/release-notes/js
- https://github.com/firebase/firebase-js-sdk/releases/tag/firebase%4012.0.0

AngularFire `20.0.1` is not compatible with it; produces compilation errors such as:
```dart
✘ [ERROR] TS2345:
Argument of type 'import("node_modules/@angular/fire/node_modules/@firebase/storage/dist/storage-public").UploadTask'
is not assignable to parameter of type 'import("node_modules/@firebase/storage/dist/storage-public").UploadTask'.
Types of property 'catch' are incompatible.
```

從 Firebase JavaScript SDK v12 的版本資訊以及 AngularFire 20.0.1 的相依性與建置設定開始，然後重現回報的 TS2345 UploadTask 不相符問題。追蹤編譯錯誤中涉及的重複 @firebase/storage 型別，並驗證 AngularFire 能夠使用 firebase 12.0.0 成功編譯。

由索引模型根據 Issue 內容生成。