java/pulsensor: Changed to C++ types and added callback functionality for Java

Signed-off-by: Andrei Vasiliu <andrei.vasiliu@intel.com>
Signed-off-by: Mihai Tudor Panu <mihai.tudor.panu@intel.com>

src/pulsensor/javaupm_pulsensor.i

@@ -2,11 +2,14 @@
 %include "../upm.i"
 %include "arrays_java.i"
 
+%feature("director") Callback;
+
 %ignore sample_thread;
 %ignore pin_ctx;
 %ignore do_sample;
 %ignore callback; 
 
+%include "Callback.h"
 %{
     #include "pulsensor.h"
 %}