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.
```

从 Firebase JavaScript SDK v12 的发行说明以及 AngularFire 20.0.1 的依赖和构建设置开始，然后重现报告的 TS2345 UploadTask 不匹配问题。追踪编译错误中涉及的重复 @firebase/storage 类型，并验证 AngularFire 能够使用 firebase 12.0.0 成功编译。

由索引模型根据 Issue 内容生成。