Add token refreshed event (#534)

Co-authored-by: github-actions <41898282+github-actions[bot]@users.noreply.github.com>

Author: lukasIO

livekit-rtc/livekit/rtc/room.py

@@ -75,6 +75,7 @@
     "reconnected",
     "room_updated",
     "moved",
+    "token_refreshed",
 ]
 
 
@@ -168,6 +169,9 @@ def __init__(
         self._text_stream_handlers: Dict[str, TextStreamHandler] = {}
         self._byte_stream_handlers: Dict[str, ByteStreamHandler] = {}
 
+        self._token: str | None = None
+        self._server_url: str | None = None
+
     def __del__(self) -> None:
         if self._ffi_handle is not None:
             FfiClient.instance.queue.unsubscribe(self._ffi_queue)
@@ -416,6 +420,8 @@ def on_participant_connected(participant):
             await room.connect("ws://localhost:7880", "your_token")
             ```
         """
+        self._server_url = url
+        self._token = token
         req = proto_ffi.FfiRequest()
         req.connect.url = url
         req.connect.token = token
@@ -886,6 +892,10 @@ def _on_room_event(self, event: proto_room.RoomEvent):
                 if participant:
                     participant._info = info
 
+        elif which == "token_refreshed":
+            self._token = event.token_refreshed.token
+            self.emit("token_refreshed")
+
     def _handle_stream_header(
         self, header: proto_room.DataStream.Header, participant_identity: str
     ):