Don't fatalError on unknown channel state

I think it's very unlikely that we're ever going to add a new channel
state without also doing a major release of the Chat SDK, but let's be
graceful about it anyway.

Author: lawrence-forooghian

Sources/AblyChat/RoomLifecycleManager.swift

@@ -54,7 +54,7 @@ internal final class DefaultRoomLifecycleManagerFactory: RoomLifecycleManagerFac
 }
 
 private extension RoomStatus {
-    init(channelState: ARTRealtimeChannelState) {
+    init?(channelState: ARTRealtimeChannelState) {
         switch channelState {
         case .initialized:
             self = .initialized
@@ -71,7 +71,7 @@ private extension RoomStatus {
         case .failed:
             self = .failed
         @unknown default:
-            fatalError("Unknown channel state \(channelState)")
+            return nil
         }
     }
 }
@@ -199,8 +199,12 @@ internal class DefaultRoomLifecycleManager: RoomLifecycleManager {
 
         // CHA-RL11b
         if event.event != .update, !hasOperationInProgress {
-            // CHA-RL11c
-            changeStatus(to: .init(channelState: event.current), error: event.reason)
+            if let roomStatus = RoomStatus(channelState: event.current) {
+                // CHA-RL11c
+                changeStatus(to: roomStatus, error: event.reason)
+            } else {
+                logger.log(message: "Got unknown channel state \(event.current)", level: .info)
+            }
         }
 
         switch event.event {