CLI does not handle deleted files from App_Resources/Android/src

If a user adds some Java/Kotlin files in the App_Resources/Android/src folder and runs a build, the files are copied into the platforms/android/app/src folder.
If the user, however, deletes some file in App_Resources/Android/src and triggers a second build, this does not change the state of the platforms/android/app/src directory.

Issue seems to be due to this logic: https://github.com/NativeScript/nativescript-cli/blob/master/lib/services/android-project-service.ts#L294

The whole implementation of the prepareAppResources method could probably be improved with setting an additional value provided to srcDir in the build.gradle

sourceSets {
    main {
        java {
            srcDir 'src/src'
        }
    }
}

As for the libs folder, it's probably a good idea to attach it as an implementation filetree(<libs_path>) in the dependencies block in the build.gradle

从 lib/services/android-project-service.ts 中的 prepareAppResources 开始，检查相关的 build.gradle sourceSets 和 dependencies 处理逻辑。通过执行构建、删除 App_Resources/Android/src 下的一个文件，然后再次构建来复现该问题；当生成的 platforms/android/app/src 状态同时反映删除和添加时，即表示完成。