Add support for Android Foreground Services

[enfipy]

https://developer.android.com/guide/components/services https://developer.android.com/guide/components/foreground-services https://developer.android.com/about/versions/oreo/background https://github.com/rust-windowing/android-ndk-rs/issues/128 https://doc.qt.io/qt-5/android-services.html https://groups.google.com/g/android-ndk/c/bPJG7sRJLcI?pli=1 https://github.com/gburca/BinderDemo

We will need to make it part of the Plugin system of crossbow. Add option to write java files, compile it with javac, and link it after stage rust_compile.