Ensure the thread suspended event is fired even if the thread was suspended when its NB model was being created.

[lahodaj]

Using the VS Code extension and running this code under debugger:

package test.threading;

public class ThreadingTest {

    public static void main(String[] args) {
        Thread.ofPlatform().start(() -> {
            System.err.println(); //breakpoint here
        });
    }
}

(having the line breakpoint on the marked line). The debugger does not properly stop at the breakpoint.

What I think is happening is that when the JPDAThreadImpl is created, it is already suspended inside the debuggee. As a consequence, the event that the thread was suspended does not go through, and the "UI" part of the debugger is not notified the thread was suspended.

The proposal here is to send the "thread suspended" event the first time the thread stops on a breakpoint, if it was created as already-suspended.