Remove "delay" activity as an implied activity. Fixes Issue #11 in the Python repo. (#149)

Author: cleemullins

libraries/microsoft-agents-hosting-core/microsoft_agents/hosting/core/channel_service_adapter.py

@@ -66,10 +66,7 @@ async def send_activities(
 
             response = ResourceResponse()
 
-            if activity.type == "delay":
-                delay_time = int((activity.value or 1000) / 1000)
-                await sleep(delay_time)
-            elif activity.type == ActivityTypes.invoke_response:
+            if activity.type == ActivityTypes.invoke_response:
                 context.turn_state[self.INVOKE_RESPONSE_KEY] = activity
             elif (
                 activity.type == ActivityTypes.trace