[TIMOB-27778] Android: Update gradle build tools to 3.6.x

*Summary:* As of Titanium 9.0.0, we're using Android gradle build tool 3.4.2 to build the SDK, apps, and modules.

'com.android.tools.build:gradle:3.4.2'

We should update the tools to version 3.6.x. https://developer.android.com/studio/releases/gradle-plugin#3-6-0 The newest build tools are supposed to improve APK build times. https://developer.android.com/studio/releases/gradle-plugin#zipflinger *Note:* We should also update our gradle template to 6.0.x which has full support for JDK 13. https://developer.android.com/studio/releases/gradle-plugin#updating-gradle https://docs.gradle.org/6.0/release-notes.html *To-Do:* We must update the version in 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 Upgrading will cause the SDK and module builds to fail. The reason is because Google's build tool will now compile C/C++ before Java, which is an issue since our kroll-apt Java annotation processor generates C++ source files. We can solve this by adding the below to the library project's "build.gradle" file.

project.afterEvaluate {
	externalNativeBuildDebug.dependsOn compileDebugJavaWithJavac
	externalNativeBuildRelease.dependsOn compileReleaseJavaWithJavac
}

https://github.com/appcelerator/titanium_mobile/blob/master/android/titanium/build.gradle https://github.com/appcelerator/titanium_mobile/blob/master/android/templates/module/generated/build.gradle We will also need to update our gradlew and gradle library folder to the newest version. https://github.com/appcelerator/titanium_mobile/tree/master/android