FR: Expose passwordUpdatedAt in auth.UserRecord

[martinflorek]

• Operating System version: Linux
• Firebase SDK version: v4.15.1
• Library version: v4.15.1
• Firebase Product: auth

Describe the problem

I need to enforce passwords rotation and for that I need the timestamp when the password was last changed. This is available via the REST API as the passwordUpdatedAt property, which is my current workaround. It would be nice to have this included in the Go SDK though, so I don't have to mix raw HTTP calls with SDK.

Steps to reproduce:

auth.UserRecord struct does not have the PasswordUpdatedAt property. Looks like the REST parsing inside the SDK is done via the userQueryResponse struct in user_mgt.go file. That one is missing this property too.

Can you make this property available please? Thanks!

[martinflorek]

Even better would be to expose everything, that the REST API returns. Otherwise the admin API is kind of limited. Thank!