feat(ui): Add floating date divider builder.

packages/stream_chat_flutter/lib/src/message_list_view/floating_date_divider.dart

@@ -18,7 +18,7 @@ class FloatingDateDivider extends StatelessWidget {
     required this.itemCount,
     @Deprecated('No longer used, Will be removed in future versions.')
     this.isThreadConversation = false,
-    this.dateDividerBuilder,
+    this.floatingDateDividerBuilder,
   });
 
   /// true if this is a thread conversation
@@ -43,7 +43,7 @@ class FloatingDateDivider extends StatelessWidget {
   ///
   /// If provided, this function will be called with the date of the message
   /// to create the date divider widget.
-  final Widget Function(DateTime)? dateDividerBuilder;
+  final Widget Function(DateTime)? floatingDateDividerBuilder;
 
   @override
   Widget build(BuildContext context) {
@@ -67,7 +67,7 @@ class FloatingDateDivider extends StatelessWidget {
         final message = messages.elementAtOrNull(index - 2);
         if (message == null) return const Empty();
 
-        if (dateDividerBuilder case final builder?) {
+        if (floatingDateDividerBuilder case final builder?) {
           return builder.call(message.createdAt.toLocal());
         }
 

packages/stream_chat_flutter/lib/src/message_list_view/message_list_view.dart

@@ -95,6 +95,7 @@ class StreamMessageListView extends StatefulWidget {
     this.threadBuilder,
     this.onThreadTap,
     this.dateDividerBuilder,
+    this.floatingDateDividerBuilder,
     // we need to use ClampingScrollPhysics to avoid the list view to bounce
     // when we are at the either end of the list view and try to use 'animateTo'
     // to animate in the same direction.
@@ -241,6 +242,10 @@ class StreamMessageListView extends StatefulWidget {
   /// Builder used to render date dividers
   final Widget Function(DateTime)? dateDividerBuilder;
 
+  /// Builder used to render floating date divider separately from
+  /// the date dividers in the list
+  final Widget Function(DateTime)? floatingDateDividerBuilder;
+
   /// Index of an item to initially align within the viewport.
   final int? initialScrollIndex;
 
@@ -852,7 +857,7 @@ class _StreamMessageListViewState extends State<StreamMessageListView> {
               reverse: widget.reverse,
               itemPositionListener: _itemPositionListener.itemPositions,
               messages: messages,
-              dateDividerBuilder: widget.dateDividerBuilder,
+              floatingDateDividerBuilder: widget.floatingDateDividerBuilder,
             ),
           ),
         if (widget.showScrollToBottom)

packages/stream_chat_flutter/test/src/message_list_view/floating_date_divider_test.dart

@@ -160,7 +160,7 @@ void main() {
               reverse: false,
               messages: messages,
               itemCount: itemCount,
-              dateDividerBuilder: (date) {
+              floatingDateDividerBuilder: (date) {
                 receivedDate = date;
                 return Container(
                   key: customKey,