Add option to collect user name during email registration

[lesnitsky]

Discussed in https://github.com/firebase/FirebaseUI-Flutter/discussions/69

^{Originally posted by bakua August 23, 2023} Hi there! I've been enjoying Firebase UI Auth, but I've noticed something. While social logins easily get display names, email sign-ups don't. Would it be possible to add an option to collect user names during email registration? It would really help keep a consistent experience for users. Thank you so much for considering this!

[lesnitsky]

As mentioned in discussion comments, this was picked up by @YassinNouh21

[lesnitsky]

@YassinNouh21 are you willing/have time to address my comment?

[YassinNouh21]

@lesnitsky yeah sorry for being late I will work on it these days

[YassinNouh21]

@lesnitsky I just pushed new commits in my PR #82

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[github-actions[bot]]

Hello 👋, to help manage issues we automatically close stale issues.

This issue has been automatically marked as stale because it has not had activity for quite some time. Has this issue been fixed, or does it still require attention?

This issue will be closed in 15 days if no further activity occurs.

Thank you for your contributions.