feat: Exposed customAttachmentBuilders through MessageListView

packages/stream_chat_flutter/lib/src/message_list_view.dart

@@ -130,6 +130,7 @@ class MessageListView extends StatefulWidget {
     this.emptyBuilder,
     this.messageListBuilder,
     this.errorWidgetBuilder,
+    this.customAttachmentBuilders,
   }) : super(key: key);
 
   /// Function used to build a custom message widget
@@ -203,6 +204,9 @@ class MessageListView extends StatefulWidget {
   /// of a connection failure.
   final ErrorBuilder errorWidgetBuilder;
 
+  /// Attachment builders for the default message widget
+  final Map<String, AttachmentBuilder> customAttachmentBuilders;
+
   @override
   _MessageListViewState createState() => _MessageListViewState();
 }
@@ -798,6 +802,7 @@ class _MessageListViewState extends State<MessageListView> {
             break;
         }
       },
+      customAttachmentBuilders: widget.customAttachmentBuilders,
     );
   }
 
@@ -958,6 +963,7 @@ class _MessageListViewState extends State<MessageListView> {
             break;
         }
       },
+      customAttachmentBuilders: widget.customAttachmentBuilders,
     );
 
     if (!message.isDeleted &&