Add imClientClosed delegate method

Author: zapcannon87

ChatKit/Class/Tool/Service/LCCKSessionService.m

@@ -162,6 +162,19 @@ - (void)imClientResumed:(AVIMClient *)imClient {
     [NSNotificationCenter.defaultCenter postNotificationName:LCCKNotificationSessionResumed object:nil];
 }
 
+- (void)imClientClosed:(AVIMClient *)imClient error:(NSError *)error
+{
+    [self updateConnectStatus];
+    [imClient openWithOption:AVIMClientOpenOptionReopen callback:^(BOOL succeeded, NSError * _Nullable error) {
+        [self updateConnectStatus];
+        if (succeeded) {
+            [NSNotificationCenter.defaultCenter postNotificationName:LCCKNotificationSessionResumed object:nil];
+        } else {
+            LCCKLog(@"%@", error.description);
+        }
+    }];
+}
+
 - (void)handleSingleSignOnError:(NSError *)aError callback:(LCCKBooleanResultBlock)aCallback {
     if (aError.code == 4111) {
         [self resetService];