feat: allow optimistically added messages in local state #1064
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Description of the changes, What, Why and How?
Changes to support optimistic DB update - GetStream/stream-chat-react-native#1758
2nd param to function
addMessagesSorted
determines weather messages being added may already exist in state or not. If they already exist, that means they were optimistically added, but timestamp of the message needs to be updated with the one stored on backend.