Issue 104: add verificationId in phone auth.

[valeriyo]

trafficstars

without verificationId, it's impossible to complete the phone sign-in flow with user-provided verification code.

See https://github.com/GitLiveApp/firebase-kotlin-sdk/issues/104

[estivensh]

@valeriyo how sad that they still do not help with the approval of this pull request, I also made a pull request almost the same as the one you have and I still have not had any response, I have seriously thought about creating my own sdk and avoid these inconveniences.

[kcn1-71]

Still no change? Is this library dead?

[nbransby]

could you resolve the conflicts?

[valeriyo]

We actually removed gitlive, and went straight to the official firebase libs 🤷‍♂️