[Async Attachment Upload] Initial implementation

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

packages/stream_chat/lib/src/api/retry_queue.dart

@@ -125,10 +125,7 @@ class RetryQueue {
   Future<void> _sendMessage(Message message) async {
     if (message.status == MessageSendingStatus.failed_update ||
         message.status == MessageSendingStatus.updating) {
-      await channel.client.updateMessage(
-        message,
-        channel.cid,
-      );
+      await channel.updateMessage(message);
     } else if (message.status == MessageSendingStatus.failed ||
         message.status == MessageSendingStatus.sending) {
       await channel.sendMessage(
@@ -136,10 +133,7 @@ class RetryQueue {
       );
     } else if (message.status == MessageSendingStatus.failed_delete ||
         message.status == MessageSendingStatus.deleting) {
-      await channel.client.deleteMessage(
-        message,
-        channel.cid,
-      );
+      await channel.client.deleteMessage(message);
     }
   }