[client] Introduce the notion of only_contextual connectors

Author: Samuel Hassine

pycti/connector/opencti_connector_helper.py

@@ -387,6 +387,9 @@ def __init__(self, config: dict):
     def get_name(self):
         return self.connect_name
 
+    def get_only_contextual(self):
+        return self.connect_only_contextual
+
     def set_state(self, state) -> None:
         """sets the connector state