Use user email as username

[romulorosa]

Proposed change

I would like to propose using the user email as username so that we would be able to remove one field (username) from the signup and improve the overall UX around the signup. That is a real use case for a project that I am currently working on at Anaconda.

I drafted a PR that can be found here #209

Alternative options

Who would use this feature?

Users interested on creating a new account

(Optional): Suggest a solution

#209

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