fix qa

lib/src/stream_chat_theme.dart

@@ -229,6 +229,7 @@ class StreamChatThemeData {
       backgroundColor: isDark ? Colors.black : Colors.white,
       defaultUserImage: (context, user) => Center(
         child: CachedNetworkImage(
+          filterQuality: FilterQuality.high,
           imageUrl: getRandomPicUrl(user),
           fit: BoxFit.cover,
         ),

lib/src/user_avatar.dart

@@ -49,6 +49,7 @@ class UserAvatar extends StatelessWidget {
               ),
               child: hasImage
                   ? CachedNetworkImage(
+                      filterQuality: FilterQuality.high,
                       imageUrl: user.extraData['image'],
                       errorWidget: (_, __, ___) {
                         return streamChatTheme.defaultUserImage(context, user);