Refactor: Update dependencies and Gradle configuration

This commit updates various dependencies and reconfigures Gradle settings to newer versions and standards.

Specific changes include:

-   Updated Android Gradle Plugin to 8.6.1
-   Updated Kotlin to 2.1.20
-   Updated Compose Compiler to 1.5.15
-   Updated Compose BOM to 2025.04.01
-   Updated Hilt to 2.54
-   Updated KSP to 2.1.20-2.0.0
-   Updated other dependencies like Navigation, Core-Ktx, Lifecycle, Activity Compose, Room, Paging, Coil, Serialization Json
-   Migrated to Java 21
-   Applied Compose plugin
- Updated target and compile SDK to 35
- updated jvm target to Java 21

build-logic/convention/build.gradle.kts

@@ -21,13 +21,15 @@ plugins {
 group = "dev.adriankuta.convention.buildlogic"
 
 java {
-    sourceCompatibility = JavaVersion.VERSION_17
-    targetCompatibility = JavaVersion.VERSION_17
+    sourceCompatibility = JavaVersion.VERSION_21
+    targetCompatibility = JavaVersion.VERSION_21
 }
 
 dependencies {
-    compileOnly(libs.android.tools.build.gradle.plugin)
-    compileOnly(libs.kotlin.gradle.plugin)
+    compileOnly(libs.android.gradlePlugin)
+    compileOnly(libs.compose.gradlePlugin)
+    compileOnly(libs.kotlin.gradlePlugin)
+    compileOnly(libs.ksp.gradlePlugin)
 }
 
 gradlePlugin {