feat: Implement QuizScreen and basic navigation structure

This commit introduces the `QuizScreen` composable, its associated `QuizScreenViewModel`, and sets up the basic navigation graph for the application.

Key changes:

- **UI Layer (`ui:quiz` module):**
    - Added `QuizScreen.kt` with a basic composable structure.
    - Implemented `QuizScreenViewModel.kt` which fetches quiz data using `GetQuizUseCase` and exposes it via `QuizUiState`.
    - Created `QuizUiState` data class to hold the quiz data for the UI.
    - Added `navigation/QuizNavigation.kt` to define the `QuizRoute` and `quizScreen` navigation extension.
    - Updated `ui/quiz/build.gradle.kts` to include dependencies for Hilt navigation and Timber.
- **App Module (`app` module):**
    - Created `KahootQuizApp.kt` which sets up the main `Scaffold` and includes the navigation graph.
    - Added `KahootQuizNavGraph.kt` to define the `NavHost` and integrate the `quizScreen`.
    - Modified `MainActivity.kt` to call the new `KahootQuizApp` composable, removing the previous direct use case call and UI.
- **Data Layer (`model:data` module):**
    - Updated `QuizMapper.kt` to convert `time` from `Long?` to `Duration?` (using `milliseconds`) when mapping `QuestionDto` to the domain `Question` model.

app/src/main/java/dev/adriankuta/kahootquiz/KahootQuizNavGraph.kt

@@ -0,0 +1,23 @@
+package dev.adriankuta.kahootquiz
+
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Modifier
+import androidx.navigation.NavHostController
+import androidx.navigation.compose.NavHost
+import androidx.navigation.compose.rememberNavController
+import dev.adriankuta.kahootquiz.ui.quiz.navigation.QuizRoute
+import dev.adriankuta.kahootquiz.ui.quiz.navigation.quizScreen
+
+@Composable
+fun KahootQuizNavGraph(
+    modifier: Modifier = Modifier,
+    navController: NavHostController = rememberNavController(),
+) {
+    NavHost(
+        navController = navController,
+        startDestination = QuizRoute,
+        modifier = modifier
+    ) {
+        quizScreen()
+    }
+}