[FR] export users in JS/TS

[louis030195]

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

Describe the solution you'd like

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

Describe alternatives you've considered

Using the CLI

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