multi: add experimental endorsement feature bit and disable option

lncfg/protocol_integration.go

@@ -70,6 +70,9 @@ type ProtocolOptions struct {
 	// NoRouteBlindingOption disables forwarding of payments in blinded routes.
 	NoRouteBlindingOption bool `long:"no-route-blinding" description:"do not forward payments that are a part of a blinded route"`
 
+	// NoExperimentalEndorsementOption disables experimental endorsement.
+	NoExperimentalEndorsementOption bool `long:"no-experimental-endorsement" description:"do not forward experimental endorsement signals"`
+
 	// CustomMessage allows the custom message APIs to handle messages with
 	// the provided protocol numbers, which fall outside the custom message
 	// number range.
@@ -127,6 +130,12 @@ func (l *ProtocolOptions) NoRouteBlinding() bool {
 	return l.NoRouteBlindingOption
 }
 
+// NoExperimentalEndorsement returns true if experimental endorsement should
+// be disabled.
+func (l *ProtocolOptions) NoExperimentalEndorsement() bool {
+	return l.NoExperimentalEndorsementOption
+}
+
 // CustomMessageOverrides returns the set of protocol messages that we override
 // to allow custom handling.
 func (l ProtocolOptions) CustomMessageOverrides() []uint16 {