feat: Added show in chat

lib/src/message_list_view.dart

@@ -116,6 +116,7 @@ class MessageListView extends StatefulWidget {
     this.scrollController,
     this.itemPositionListener,
     this.highlightInitialMessage = false,
+    this.onShowMessage,
   }) : super(key: key);
 
   /// Function used to build a custom message widget
@@ -162,6 +163,8 @@ class MessageListView extends StatefulWidget {
   /// Also See [StreamChannel]
   final bool highlightInitialMessage;
 
+  final ShowMessageCallback onShowMessage;
+
   @override
   _MessageListViewState createState() => _MessageListViewState();
 }
@@ -711,6 +714,7 @@ class _MessageListViewState extends State<MessageListView> {
       messageTheme: isMyMessage
           ? StreamChatTheme.of(context).ownMessageTheme
           : StreamChatTheme.of(context).otherMessageTheme,
+      onShowMessage: widget.onShowMessage,
     );
   }
 
@@ -788,6 +792,7 @@ class _MessageListViewState extends State<MessageListView> {
           : StreamChatTheme.of(context).otherMessageTheme,
       readList: readList,
       allRead: allRead,
+      onShowMessage: widget.onShowMessage,
     );
 
     if (!initialMessageHighlightComplete &&