Feat: Build the UI for Phone Number Authentication

[lkmandy]

Description:

As part of our app's login feature, we would like to add the ability for users to authenticate using their phone numbers.
The implementation should include the ability for users to sign in and signup using their phone numbers.

Here are the specific requirements the UI should enable users to do:

• Build the UIs following the existing designs
• Allow users to sign in and signup with their phone number
• Allow users to sign out
• Handle errors and display appropriate messages to the user
• Implement a way to check if the user is already logged in
• Implement an OTP verification process to verify phone numbers using Twillio or a similar service provider

Acceptance Criteria:

• User can sign in to the app with their phone number
• User's phone number is retrieved and displayed in the app
• Error messages are displayed to the user when appropriate
• The app can check if the user is already logged in with their phone number

Screenshots/visuals