[TIMOB-27938] Android: Update gradle build tools to 4.0.x

*Summary:* Titanium currently builds with "com.android.tools.build:gradle" tool version 3.6.2. We should update it to 4.0.0. https://developer.android.com/studio/releases/gradle-plugin?buildsystem=ndk-build#4-0-0 *To-Do:* We must update the following files... https://github.com/appcelerator/titanium_mobile/blob/master/android/build.gradle https://github.com/appcelerator/titanium_mobile/blob/master/android/templates/build/root.build.gradle *Note:* You must use Android Studio 4.x to build a project using Android gradle tools 4.0.0 or higher.