feat: expose participant_active event and joined_at, state fields

Author: davidzhao

livekit-rtc/livekit/rtc/__init__.py

@@ -20,7 +20,7 @@
 
 from ._proto import stats_pb2 as stats
 from ._proto.e2ee_pb2 import EncryptionState, EncryptionType
-from ._proto.participant_pb2 import ParticipantKind, DisconnectReason
+from ._proto.participant_pb2 import ParticipantKind, ParticipantState, DisconnectReason
 from ._proto.room_pb2 import (
     ConnectionQuality,
     ConnectionState,
@@ -136,6 +136,7 @@
     "LocalParticipant",
     "Participant",
     "ParticipantKind",
+    "ParticipantState",
     "DisconnectReason",
     "RemoteParticipant",
     "ConnectError",