Add initial MSC4186 (Simplified Sliding Sync) implementation

Signed-off-by: morguldir <morguldir@protonmail.com>
Signed-off-by: strawberry <strawberry@puppygock.gay>

src/service/rooms/read_receipt/mod.rs

@@ -155,6 +155,7 @@ where
 	}
 	let content = ReceiptEventContent::from_iter(json);
 
+	conduwuit::trace!(?content);
 	Raw::from_json(
 		serde_json::value::to_raw_value(&SyncEphemeralRoomEvent { content })
 			.expect("received valid json"),