JvmAsyncOperations

Runs fn in a cancellationScope where it will be interrupted (as a Java thread) upon cancellation.

Note that fn will need to handle both java.util.concurrent.CancellationException (when performing Gears operations such as .await) and java.lang.InterruptedException, so the intended use case is usually to wrap interruptible Java operations, containing fn to a narrow scope.

Suspends the current Async context for at least millis milliseconds.