[Persistence] Add support for pinned messages

Signed-off-by: Sahil Kumar <[email protected]>

packages/stream_chat_persistence/lib/src/mapper/message_mapper.dart

@@ -8,6 +8,7 @@ extension MessageEntityX on MessageEntity {
   /// Maps a [MessageEntity] into [Message]
   Message toMessage({
     User user,
+    User pinnedBy,
     List<Reaction> latestReactions,
     List<Reaction> ownReactions,
     Message quotedMessage,
@@ -37,6 +38,10 @@ extension MessageEntityX on MessageEntity {
       text: messageText,
       user: user,
       deletedAt: deletedAt,
+      pinned: pinned,
+      pinnedAt: pinnedAt,
+      pinExpires: pinExpires,
+      pinnedBy: pinnedBy,
     );
   }
 }
@@ -67,6 +72,10 @@ extension MessageX on Message {
       userId: user?.id,
       deletedAt: deletedAt,
       messageText: text,
+      pinned: pinned,
+      pinnedAt: pinnedAt,
+      pinExpires: pinExpires,
+      pinnedByUserId: pinnedBy?.id,
     );
   }
 }