feat: add message_type property to TalkBotMessage (#292)

Sample chat message structure:
https://nextcloud-talk.readthedocs.io/en/latest/bots/#sample-chat-message

Signed-off-by: Anupam Kumar <[email protected]>

Author: kyteinsky

nc_py_api/talk_bot.py

@@ -29,6 +29,11 @@ class TalkBotMessage:
     def __init__(self, raw_data: dict):
         self._raw_data = raw_data
 
+    @property
+    def message_type(self) -> str:
+        """The type of message like Join, Leave, Create, Activity, etc."""
+        return self._raw_data["type"]
+
     @property
     def actor_id(self) -> str:
         """One of the attendee types followed by the ``/`` character and a unique identifier within the given type.