feat: add flag for floating date divider

packages/stream_chat_flutter/lib/src/message_list_view.dart

@@ -161,6 +161,7 @@ class MessageListView extends StatefulWidget {
     this.pinPermissions = const [],
     this.textBuilder,
     this.usernameBuilder,
+    this.showFloatingDateDivider = true,
   }) : super(key: key);
 
   /// Function used to build a custom message widget
@@ -227,6 +228,9 @@ class MessageListView extends StatefulWidget {
   /// Flag for showing tile on header
   final bool showConnectionStateTile;
 
+  /// Flag for showing the floating date divider
+  final bool showFloatingDateDivider;
+
   /// Function called when messages are fetched
   final Widget Function(BuildContext, List<Message>)? messageListBuilder;
 
@@ -567,7 +571,12 @@ class _MessageListViewState extends State<MessageListView> {
           },
         ),
         if (widget.showScrollToBottom) _buildScrollToBottom(),
-        Positioned(
+        if (widget.showFloatingDateDivider) _buildFloatingDateDivider(),
+      ],
+    );
+  }
+
+  Positioned _buildFloatingDateDivider() => Positioned(
         top: 20,
         child: BetterStreamBuilder<Iterable<ItemPosition>>(
           initialData: _itemPositionListener.itemPositions.value,
@@ -605,10 +614,7 @@ class _MessageListViewState extends State<MessageListView> {
                   );
           },
         ),
-        ),
-      ],
       );
-  }
 
   Future<void> _paginateData(
           StreamChannelState? channel, QueryDirection direction) =>