BUG: Firebase Auth/Import Users: a phone number field is missing in a user identity provider struct

[mymyparty]

Environment

• Operating System version: macOS 13.2.1
• Firebase SDK version: Firebase Admin SDK v4
• Library version: v4.10.0
• Firebase Product: auth

A problem

We actively use Firebase Auth in a new project.
Some tools and services are written in Go.
We want to migrate existing users to Firebase.
So we use Firebase Auth's Import Users feature.
Almost all works well, but it is hard to test some cases because some info is missing in the docs.
That is why being looking through the Firebase Auth docs for other programming languages (https://firebase.google.com/docs/reference/admin/node/firebase-admin.auth.userproviderrequest.md#properties)
we figured out that a phoneNumber field is missing in the auth.UserProvider struct in Go version of the sdk.

Reproduce

Just take a look at Node.js' docs https://firebase.google.com/docs/reference/admin/node/firebase-admin.auth.userproviderrequest.md#properties
and at source codes of Go version

firebase-admin-go/auth/import_users.go

Line 195 in 1d24577

 type UserProvider struct { 

Relevant Code

The UserProvider struct should have all the fields that Node.js version has:

type UserProvider struct {
	UID         string `json:"rawId"`
	ProviderID  string `json:"providerId"`
	Email       string `json:"email,omitempty"`
	PhoneNumber string `json:"phoneNumber,omitempty"` // missing field in current version
	DisplayName string `json:"displayName,omitempty"`
	PhotoURL    string `json:"photoUrl,omitempty"`
}

A use case:

	if p.Phone != nil {
		providers = append(providers, &auth.UserProvider{
			UID:         p.ID.String(),
			ProviderID:  ProviderPhone,
			PhoneNumber: *p.Phone,
			DisplayName: displayName,
		})
	}

A main idea is the same fields should be used across all the implementations of the Firebase Admin API.