[wpilibj] Call abort() on Rio on caught Java exception (#6420)

On Rio, we simply want to restart the robot program as quickly as possible,
and don't want to risk a hang somewhere that will keep that from happening.

The main downside of this is it won't wait for threads to finish (e.g. data logs won't get a final flush).

hal/src/main/java/edu/wpi/first/hal/HAL.java

@@ -75,6 +75,9 @@ public final class HAL extends JNIWrapper {
    */
   public static native void exitMain();
 
+  /** Terminates the executable (at the native level). Does nothing in simulation. */
+  public static native void terminate();
+
   private static native void simPeriodicBeforeNative();
 
   private static final List<Runnable> s_simPeriodicBefore = new ArrayList<>();