adding pulse_generator_constraints to the PredefinedGeneratorBase cla…

…ss to have access to them in the custom predefined methods

logic/pulsed/pulse_objects.py

@@ -1026,6 +1026,10 @@ def save_sequence(self):
     def generation_parameters(self):
         return self.__sequencegeneratorlogic.generation_parameters
 
+    @property
+    def pulse_generator_constraints(self):
+        return self.__sequencegeneratorlogic.pulse_generator_constraints
+
     @property
     def channel_set(self):
         channels = self.pulse_generator_settings.get('activation_config')