updating create conversation to take conversation params

[Virtual-Josh]

No description provided.

[johnataylor]

Looks like the create_conversation code in Python is not setting the activity type nor the activity name on the event activity that is used to run the middleware.

Specifically the code:

request = TurnContext.apply_conversation_reference(
                Activity(), reference, is_incoming=True
            )

should set the Activity to have type = "event" and name = "CreateConversation"