Unify the 3 interface modes (#3554)

extensions/example/script.py

@@ -59,7 +59,7 @@ def chat_input_modifier(text, visible_text, state):
     """
     return text, visible_text
 
-def input_modifier(string, state):
+def input_modifier(string, state, is_chat=False):
     """
     In default/notebook modes, modifies the whole prompt.
 
@@ -92,7 +92,7 @@ def logits_processor_modifier(processor_list, input_ids):
     processor_list.append(MyLogits())
     return processor_list
 
-def output_modifier(string, state):
+def output_modifier(string, state, is_chat=False):
     """
     Modifies the LLM output before it gets presented.