msggen: Map the extratlvs field of keysend

Changelog-Added: cln-rpc: `keysend` now exposes the `extratlvs` field

cln-grpc/proto/node.proto

@@ -968,6 +968,7 @@ message KeysendRequest {
 	optional uint32 maxdelay = 6;
 	optional Amount exemptfee = 7;
 	optional RoutehintList routehints = 8;
+	optional TlvStream extratlvs = 9;
 }
 
 message KeysendResponse {
@@ -986,9 +987,6 @@ message KeysendResponse {
 	KeysendStatus status = 9;
 }
 
-message KeysendExtratlvs {
-}
-
 message FundpsbtRequest {
 	AmountOrAll satoshi = 1;
 	Feerate feerate = 2;

cln-grpc/proto/primitives.proto

@@ -72,4 +72,13 @@ message Routehint {
 }
 message RoutehintList {
 	repeated Routehint hints = 2;
-}
+}
+
+
+message TlvEntry {
+	uint64 type = 1;
+	bytes value = 2;
+}
+message TlvStream {
+	repeated TlvEntry entries = 1;
+}