- gradle version upgrade

- migrated to AndroidX
 - migrated to Kotlin
 - Content resolver unit test added
 - Upgraded android version to 31

gradle.properties

@@ -9,6 +9,8 @@
 
 # Specifies the JVM arguments used for the daemon process.
 # The setting is particularly useful for tweaking memory settings.
+android.enableJetifier=true
+android.useAndroidX=true
 org.gradle.jvmargs=-Xmx1536m
 
 # When configured, Gradle will run in incubating parallel mode.