Android target kinds with Kotlin support and APK run

Once now ships first-class Starlark target kinds for Android: android_resource, android_library, and android_binary. Kotlin source files are supported in addition to Java, and android_binary builds APKs and can once run them by installing on a device, resolving the launcher activity, and starting it through direct adb actions. Bundled starter examples and Android graph and prelude reference docs are included.