feat(ui_auth): add display name screen when user register

[YassinNouh21]

Description

This PR enhances the SignInScreen widget by adding a new feature. When the displayName property of the user is found to be null, the app will now navigate the user to a screen titled "What is your name?" where they can input or edit their display name. This feature provides a more user-friendly.

Related Issues

This is based on Discussed in 69 and Issue 76 for enhancement

Checklist

• [x] I read the Contributor Guide and followed the process outlined there for submitting PRs.
• [x] My PR includes unit or integration tests for all changed/updated/fixed behaviors (See Contributor Guide).
• [x] All existing and new tests are passing.
• [x] I updated/added relevant documentation (doc comments with ///).
• [x] The analyzer (melos run analyze) does not report any problems on my PR.
• [x] All unit tests pass (melos run test:unit:all doesn't fail).
• [x] I read and followed the Flutter Style Guide.
• [x] I signed the CLA.
• [x] I am willing to follow-up on review comments in a timely manner.

Breaking Change

Does your PR require plugin users to manually update their apps to accommodate your change?

• [ ] Yes, this is a breaking change.
• [x] No, this is not a breaking change.

[lesnitsky]

While this is a good showcase of how this could be done with the current API, the idea behind #76 was to implement the screen in the library, so that it is responsive as the rest of the *Screen widgets (see ResponsivePage), support localizations, use UniversalScaffold. @YassinNouh21 would you be willing to implement such a widget?

[lesnitsky]

@YassinNouh21 would you be willing to address my feedback?

[YassinNouh21]

@lesnitsky today I will address it

[lesnitsky]

@YassinNouh21 any updates on this PR?

[YassinNouh21]

@YassinNouh21 any updates on this PR?

Sorry I been busy this week I will finish it by the weekend

[lesnitsky]

@YassinNouh21 any updates on this?

[bakua]

Shame :/