add onLinkTap

packages/stream_chat_flutter/lib/src/message_list_view.dart

@@ -142,6 +142,7 @@ class MessageListView extends StatefulWidget {
     this.onSystemMessageTap,
     this.onAttachmentTap,
     this.textBuilder,
+    this.onLinkTap,
   }) : super(key: key);
 
   /// Function used to build a custom message widget
@@ -237,6 +238,8 @@ class MessageListView extends StatefulWidget {
   /// Customize the MessageWidget textBuilder
   final void Function(BuildContext context, Message message) textBuilder;
 
+  final void Function(String link) onLinkTap;
+
   @override
   _MessageListViewState createState() => _MessageListViewState();
 }
@@ -844,6 +847,7 @@ class _MessageListViewState extends State<MessageListView> {
         FocusScope.of(context).unfocus();
       },
       textBuilder: widget.textBuilder,
+      onLinkTap: widget.onLinkTap,
     );
   }
 
@@ -1021,6 +1025,7 @@ class _MessageListViewState extends State<MessageListView> {
       },
       onAttachmentTap: widget.onAttachmentTap,
       textBuilder: widget.textBuilder,
+      onLinkTap: widget.onLinkTap,
     );
 
     if (!message.isDeleted &&