FIXME: This is actually from BOLT 4, but we remove it from onion_wire.csv and put it here.

--- peer_wire.csv	2021-08-25 12:41:02.876254003 +0930
+++ peer_wire.csv.raw	2021-08-25 13:42:31.991693809 +0930
@@ -320,3 +210,7 @@
 msgdata,gossip_timestamp_filter,chain_hash,chain_hash,
 msgdata,gossip_timestamp_filter,first_timestamp,u32,
 msgdata,gossip_timestamp_filter,timestamp_range,u32,
+msgtype,onion_message,513,option_onion_messages
+msgdata,onion_message,blinding,point,
+msgdata,onion_message,len,u16,
+msgdata,onion_message,onionmsg,byte,len