chore: update message_theme.dart

Includes Diagnosticable, more descriptive field names, lerp, ==, and hashCode

packages/stream_chat_flutter/lib/src/message_widget.dart

@@ -283,7 +283,7 @@ class MessageWidget extends StatefulWidget {
   final Message message;
 
   /// The message theme
-  final MessageTheme messageTheme;
+  final MessageThemeData messageTheme;
 
   /// If true the widget will be mirrored
   final bool reverse;
@@ -413,7 +413,7 @@ class MessageWidget extends StatefulWidget {
     Widget Function(BuildContext, Message)? usernameBuilder,
     void Function(BuildContext, Message)? onMessageActions,
     Message? message,
-    MessageTheme? messageTheme,
+    MessageThemeData? messageTheme,
     bool? reverse,
     ShapeBorder? shape,
     ShapeBorder? attachmentShape,
@@ -888,14 +888,14 @@ class _MessageWidgetState extends State<MessageWidget>
           ),
         InkWell(
           onTap: widget.onThreadTap != null ? onThreadTap : null,
-          child: Text(msg, style: widget.messageTheme.replies),
+          child: Text(msg, style: widget.messageTheme.repliesStyle),
         ),
       ],
       if (showUsername) _buildUsername(usernameKey),
       if (showTimeStamp)
         Text(
           Jiffy(widget.message.createdAt.toLocal()).jm,
-          style: widget.messageTheme.createdAt,
+          style: widget.messageTheme.createdAtStyle,
         ),
       if (showSendingIndicator) _buildSendingIndicator(),
     ]);
@@ -912,7 +912,7 @@ class _MessageWidgetState extends State<MessageWidget>
           Container(
             margin: EdgeInsets.only(
               bottom: context.textScaleFactor *
-                  ((widget.messageTheme.replies?.fontSize ?? 1) / 2),
+                  ((widget.messageTheme.repliesStyle?.fontSize ?? 1) / 2),
             ),
             child: CustomPaint(
               size: const Size(16, 32) * context.textScaleFactor,
@@ -939,7 +939,7 @@ class _MessageWidgetState extends State<MessageWidget>
           Container(
             margin: EdgeInsets.only(
               bottom: context.textScaleFactor *
-                  ((widget.messageTheme.replies?.fontSize ?? 1) / 2),
+                  ((widget.messageTheme.repliesStyle?.fontSize ?? 1) / 2),
             ),
             child: CustomPaint(
               size: const Size(16, 32) * context.textScaleFactor,
@@ -962,7 +962,7 @@ class _MessageWidgetState extends State<MessageWidget>
       widget.message.user!.name,
       maxLines: 1,
       key: usernameKey,
-      style: widget.messageTheme.messageAuthor,
+      style: widget.messageTheme.messageAuthorStyle,
       overflow: TextOverflow.ellipsis,
     );
   }
@@ -1186,7 +1186,7 @@ class _MessageWidgetState extends State<MessageWidget>
   }
 
   Widget _buildSendingIndicator() {
-    final style = widget.messageTheme.createdAt;
+    final style = widget.messageTheme.createdAtStyle;
     final message = widget.message;
 
     if (hasNonUrlAttachments &&
@@ -1263,8 +1263,8 @@ class _MessageWidgetState extends State<MessageWidget>
                   onMentionTap: widget.onMentionTap,
                   messageTheme: isOnlyEmoji
                       ? widget.messageTheme.copyWith(
-                          messageText:
-                              widget.messageTheme.messageText!.copyWith(
+                          messageTextStyle:
+                              widget.messageTheme.messageTextStyle!.copyWith(
                           fontSize: 42,
                         ))
                       : widget.messageTheme,