fixup! splice: Add start_batch and an internal wire type

Author: ddustin

wire/extracted_peer_12_splice_update.patch

@@ -0,0 +1,24 @@
+diff --git a/wire/peer_wire.csv b/wire/peer_wire.csv
+index 9abcb0e64..e2aae8efb 100644
+--- a/wire/peer_wire.csv
++++ b/wire/peer_wire.csv
+@@ -1,3 +1,6 @@
++msgtype,protocol_batch_element,0
++msgdata,protocol_batch_element,channel_id,channel_id,
++msgdata,protocol_batch_element,element_size,u16,
+ msgtype,init,16
+ msgdata,init,gflen,u16,
+ msgdata,init,globalfeatures,byte,gflen
+@@ -293,6 +296,12 @@ msgdata,update_fail_malformed_htlc,channel_id,channel_id,
+ msgdata,update_fail_malformed_htlc,id,u64,
+ msgdata,update_fail_malformed_htlc,sha256_of_onion,sha256,
+ msgdata,update_fail_malformed_htlc,failure_code,u16,
++msgtype,start_batch,127
++msgdata,start_batch,channel_id,channel_id,
++msgdata,start_batch,batch_size,u16,
++msgdata,start_batch,batch_info,start_batch_tlvs,
++tlvtype,start_batch_tlvs,batch_info,1
++tlvdata,start_batch_tlvs,batch_info,message_type,u16,
+ msgtype,commitment_signed,132
+ msgdata,commitment_signed,channel_id,channel_id,
+ msgdata,commitment_signed,signature,signature,