Can support be provided for [Process.toHandle()](https://docs.oracle.com/javase/9/docs/api/java/lang/Process.html#toHandle--) in [WindowsProcess](https://github.com/ow2-proactive/programming/blob/proactive-light/programming-extensions/programming-extension-processbuilder/src/main/java/org/objectweb/proactive/extensions/processbuilder/WindowsProcess.java) class. It will be helpful in obtaining child processes. Thanks