refactor(ui, core): Deprecate v3

Signed-off-by: xsahil03x <[email protected]>

packages/stream_chat_flutter/lib/src/thread_header.dart

@@ -3,6 +3,11 @@ import 'package:flutter/services.dart';
 import 'package:stream_chat_flutter/src/extension.dart';
 import 'package:stream_chat_flutter/stream_chat_flutter.dart';
 
+/// {@macro thread_header}
+@Deprecated("Use 'StreamThreadHeader' instead")
+typedef ThreadHeader = StreamThreadHeader;
+
+/// {@template thread_header}
 /// ![screenshot](https://raw.githubusercontent.com/GetStream/stream-chat-flutter/master/packages/stream_chat_flutter/screenshots/thread_header.png)
 /// ![screenshot](https://raw.githubusercontent.com/GetStream/stream-chat-flutter/master/packages/stream_chat_flutter/screenshots/thread_header_paint.png)
 ///
@@ -56,9 +61,11 @@ import 'package:stream_chat_flutter/stream_chat_flutter.dart';
 /// The widget components render the ui based on the first ancestor of type
 /// [StreamChatTheme] and on its [ChannelTheme.channelHeaderTheme] property.
 /// Modify it to change the widget appearance.
-class ThreadHeader extends StatelessWidget implements PreferredSizeWidget {
+/// {@endtemplate}
+class StreamThreadHeader extends StatelessWidget
+    implements PreferredSizeWidget {
   /// Instantiate a new ThreadHeader
-  const ThreadHeader({
+  const StreamThreadHeader({
     Key? key,
     required this.parent,
     this.showBackButton = true,
@@ -102,12 +109,12 @@ class ThreadHeader extends StatelessWidget implements PreferredSizeWidget {
   /// if a user is typing in this thread
   final bool showTypingIndicator;
 
-  /// The background color of this [ThreadHeader].
+  /// The background color of this [StreamThreadHeader].
   final Color? backgroundColor;
 
   @override
   Widget build(BuildContext context) {
-    final channelHeaderTheme = ChannelHeaderTheme.of(context);
+    final channelHeaderTheme = StreamChannelHeaderTheme.of(context);
 
     final defaultSubtitle = subtitle ??
         Row(
@@ -162,7 +169,7 @@ class ThreadHeader extends StatelessWidget implements PreferredSizeWidget {
               const SizedBox(height: 2),
               if (showTypingIndicator)
                 Align(
-                  child: TypingIndicator(
+                  child: StreamTypingIndicator(
                     channel: StreamChannel.of(context).channel,
                     style: channelHeaderTheme.subtitleStyle,
                     parentId: parent.id,