Upgrade project to new Android Studio template and migrate Java code to Kotlin (#3937)

### Summary
- Updated the project structure using the latest Android Studio template.
- Migrated portions of the codebase from Java to Kotlin for improved readability and maintainability.

### Details
- Refactored and reorganized files according to the new Android Studio project template to ensure compatibility with the latest project standards.
- Migrated key Java classes to Kotlin, adopting Kotlin idioms and improving type safety.
- Verified that core functionalities remain intact after migration and update.
- Removed redundant Java files and updated imports where necessary.

### Notes
- Further Kotlin migration may be needed as additional Java files are reviewed.
- Test thoroughly to confirm that all functionalities work as expected after these changes.

V2rayNG/gradle.properties

@@ -1,6 +1,24 @@
-kotlin.incremental=true
+# Project-wide Gradle settings.
+# IDE (e.g. Android Studio) users:
+# Gradle settings configured through the IDE *will override*
+# any settings specified in this file.
+# For more details on how to configure your build environment visit
+# http://www.gradle.org/docs/current/userguide/build_environment.html
+# Specifies the JVM arguments used for the daemon process.
+# The setting is particularly useful for tweaking memory settings.
+org.gradle.jvmargs=-Xmx2048m -Dfile.encoding=UTF-8
+# When configured, Gradle will run in incubating parallel mode.
+# This option should only be used with decoupled projects. For more details, visit
+# https://developer.android.com/r/tools/gradle-multi-project-decoupled-projects
+# org.gradle.parallel=true
+# AndroidX package structure to make it clearer which packages are bundled with the
+# Android operating system, and which are packaged with your app's APK
+# https://developer.android.com/topic/libraries/support-library/androidx-rn
 android.useAndroidX=true
-android.enableJetifier=true
+# Kotlin code style for this project: "official" or "obsolete":
 kotlin.code.style=official
+# Enables namespacing of each library's R class so that its R class includes only the
+# resources declared in the library itself and none from the library's dependencies,
+# thereby reducing the size of the R class for that library
 android.nonTransitiveRClass=true
-org.gradle.jvmargs=-Xmx2048m -XX:+HeapDumpOnOutOfMemoryError -Dfile.encoding=UTF-8
+kotlin.incremental=true