edge case for read receipts

[dltacube]

Sometimes a new message will come in with a read receipt already included in the payload. That'll happen if for instance you have the messages app open to that specific conversation. BlueBubbles will emit only a single event (new message) rather than two and this code splits that event into its parts.

[dltacube]

Before this is ready, it should probably be done for any other message that might come from bluebubbles already retracted, blank, edited, etc...

Might also be able to remove the code block from the new messages block according to @trek-boldly-go