Encapsulate lib version through modules

build.gradle

@@ -1,6 +1,10 @@
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 buildscript {
     ext.kotlin_version = '1.4.32'
+    ext.android_core_version = '1.3.2'
+    ext.android_appcompat_version = '1.2.0'
+    ext.android_material_version = '1.3.0'
+    ext.android_test_version = '1.4.0'
     repositories {
         mavenCentral()
         google()