[#511] Define unit tests for email auth

[roberlander2]

Description

This PR moves the Twilio-specific phone auth implementation to its own adapter so phone auth can more easily use other phone verifiers. It also adds tests for the email auth implementation of the authType interface.

Resolves #511

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[petyos]

Hi @roberlander2 , thanks for defining a twillio adapter. All this looks good to me.