feat: implement event buffer for offline msgs

!BREAKING_CHANGE

1. this allows all offline notifications to be combined into a batch -- to reduce the number of events being sent out
2. to enable the above, the "message.reaction" event has been made an array. Also removes the need for the "operation" field
3. have also now started processing all events under a single queue to prevent state sync problems

src/Types/Message.ts

@@ -186,7 +186,12 @@ export type MessageContentGenerationOptions = MediaGenerationOptions & {
 }
 export type MessageGenerationOptions = MessageContentGenerationOptions & MessageGenerationOptionsFromContent
 
-export type MessageUpdateType = 'append' | 'notify' | 'replace'
+/**
+ * Type of message upsert
+ * 1. notify => notify the user, this message was just received
+ * 2. append => append the message to the chat history, no notification required
+ */
+export type MessageUpsertType = 'append' | 'notify'
 
 export type MessageUserReceipt = proto.IUserReceipt