[FR] export users in JS/TS

**Is your feature request related to a problem? Please describe.**

I want to export my Firebase Authentication users in NodeJS [just as it's possible for Firestore](https://firebase.google.com/docs/firestore/solutions/schedule-export)

**Describe the solution you'd like**

```ts
import * as admin from "firebase-admin";
admin.auth().exportUsers({
outputUriPrefix: "gs://foo-bar",
});
```

**Describe alternatives you've considered**

[Using the CLI](https://firebase.google.com/docs/cli/auth)

首先检查现有的 NodeJS Firebase Authentication API 以及链接的 Firebase CLI 身份验证导出文档，然后对比链接的 Firestore 导出解决方案。当存在一个受支持的 exportUsers API，能够接受所请求的 outputUriPrefix，并提供与文档化导出工作流一致的行为时，即视为完成。

由索引模型根据 Issue 内容生成。