Rewrite codelab in Compose

[cy245]

[gemini-code-assist[bot]]

Summary of Changes

Hello @cy245, I'm Gemini Code Assist[^1]! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request represents a major architectural shift, refactoring the entire codelab application to leverage Jetpack Compose for its UI. The change aims to modernize the codebase, improve maintainability, and align with current Android development best practices. While the UI layer is completely revamped, the underlying credential management functionality is preserved, with new ViewModel layers facilitating interaction between the UI and the credential APIs.

Highlights

• UI Framework Migration: The application's user interface has been completely rewritten from a Fragment-based architecture to Jetpack Compose, introducing new Composable screens for main, sign-up, sign-in, and home views.
• Build Configuration Updates: The project's compileSdk and targetSdk have been upgraded to version 35, along with updates to the Kotlin compiler extension and Android Gradle Plugin versions. Jetpack Compose build features and dependencies have been integrated.
• Navigation System Overhaul: The navigation logic has been migrated from Fragment transactions to androidx.navigation.compose, utilizing a NavHost and a sealed class for defining navigation routes.
• Credential Management Utilities: New utility files (CredentialManagerUtil.kt, JsonProvider.kt) and ViewModels (SignInViewModel.kt, SignUpViewModel.kt) have been introduced to encapsulate credential manager API calls and JSON data handling, aligning with the Compose UI and MVVM pattern.
• Asset and String Resource Changes: The rpId and rp.name in the AuthFromServer and RegFromServer assets have been updated. Numerous new string resources have been added to support the text content of the new Compose UI.

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