feat(llc, ui, persistence): Add message delivery receipts (#2429)

Author: xsahil03x

packages/stream_chat/CHANGELOG.md

@@ -4,6 +4,13 @@
 
 - Added support for user-level privacy settings via `OwnUser.privacySettings`.
 - Added `invisible` field to `User` and `OwnUser` models.
+- Added message delivery receipts support with `lastDeliveredAt` and `lastDeliveredMessageId` fields
+  in `Read` model.
+- Added `Client.markChannelsDelivered` method to submit delivery receipts.
+- Added `deliveriesOf` and `readsOf` helper methods to `ReadIterableExtension` for querying read and
+  delivery statuses.
+- Added channel capability getters: `Channel.canUseDeliveryReceipts`, `Channel.canUseReadReceipts`,
+  `Channel.canUseTypingEvents`.
 
 ⚠️ Deprecated