refactor(build): Migrate BuildConfig to Gradle Build Files

WARNING: The option setting 'android.defaults.buildfeatures.buildconfig=true' is deprecated.
The current default is 'false'.
It will be removed in version 9.0 of the Android Gradle plugin.
To keep using this feature, add the following to your module-level build.gradle files:
    android.buildFeatures.buildConfig = true
or from Android Studio, click: `Refactor` > `Migrate BuildConfig to Gradle Build Files`.

gradle.properties

@@ -9,7 +9,6 @@
 
 # Specifies the JVM arguments used for the daemon process.
 # The setting is particularly useful for tweaking memory settings.
-android.defaults.buildfeatures.buildconfig=true
 android.enableJetifier=false
 android.nonFinalResIds=false
 android.nonTransitiveRClass=false