feature: define new feature bit for bolt11 blinded paths

We need a new feature bit for BOLT11 invoices in order to indicate that
they contain the new blinded path tagged field. Tagged fields pre-date
TLV and so nodes who dont understand them will simply skip them.
Therefore the feature bit helps them to fail fast.

feature/default_sets.go

@@ -92,4 +92,7 @@ var defaultSetDesc = setDesc{
 		SetInit:    {}, // I
 		SetNodeAnn: {}, // N
 	},
+	lnwire.Bolt11BlindedPathsOptional: {
+		SetInvoice: {}, // I
+	},
 }

feature/deps.go

@@ -82,8 +82,8 @@ var deps = depDesc{
 	lnwire.RouteBlindingOptional: {
 		lnwire.TLVOnionPayloadOptional: {},
 	},
-	lnwire.RouteBlindingRequired: {
-		lnwire.TLVOnionPayloadRequired: {},
+	lnwire.Bolt11BlindedPathsOptional: {
+		lnwire.RouteBlindingOptional: {},
 	},
 }
 

feature/manager.go

@@ -128,6 +128,8 @@ func newManager(cfg Config, desc setDesc) (*Manager, error) {
 			raw.Unset(lnwire.MPPRequired)
 			raw.Unset(lnwire.RouteBlindingOptional)
 			raw.Unset(lnwire.RouteBlindingRequired)
+			raw.Unset(lnwire.Bolt11BlindedPathsOptional)
+			raw.Unset(lnwire.Bolt11BlindedPathsRequired)
 			raw.Unset(lnwire.AMPOptional)
 			raw.Unset(lnwire.AMPRequired)
 			raw.Unset(lnwire.KeysendOptional)
@@ -187,6 +189,8 @@ func newManager(cfg Config, desc setDesc) (*Manager, error) {
 		if cfg.NoRouteBlinding {
 			raw.Unset(lnwire.RouteBlindingOptional)
 			raw.Unset(lnwire.RouteBlindingRequired)
+			raw.Unset(lnwire.Bolt11BlindedPathsOptional)
+			raw.Unset(lnwire.Bolt11BlindedPathsRequired)
 		}
 		for _, custom := range cfg.CustomFeatures[set] {
 			if custom > set.Maximum() {