[log] don't direct or document Stdout Stderr are directed to logcat on Android

[Legend-Master]

We currently direct Stdout and Stderr targets through android_logger::log instead of actually going through the rust stdout, this is a bit unexpected given we log other rust stdout to RustStdoutStderr target on Android logcat

We should either document this behavior or change it to use the default stdout and introduce a feature flag or new target for the android_logger::log method