feature: add awareness of new taproot chans overlay feature bit

This bit will be false by default in current production deployments.

Author: Roasbeef

feature/default_sets.go

@@ -92,4 +92,8 @@ var defaultSetDesc = setDesc{
 		SetInit:    {}, // I
 		SetNodeAnn: {}, // N
 	},
+	lnwire.SimpleTaprootOverlayChansOptional: {
+		SetInit:    {}, // I
+		SetNodeAnn: {}, // N
+	},
 }

feature/deps.go

@@ -79,6 +79,11 @@ var deps = depDesc{
 		lnwire.AnchorsZeroFeeHtlcTxOptional: {},
 		lnwire.ExplicitChannelTypeOptional:  {},
 	},
+	lnwire.SimpleTaprootOverlayChansOptional: {
+		lnwire.SimpleTaprootChannelsOptionalStaging: {},
+		lnwire.TLVOnionPayloadOptional:              {},
+		lnwire.ScidAliasOptional:                    {},
+	},
 	lnwire.RouteBlindingOptional: {
 		lnwire.TLVOnionPayloadOptional: {},
 	},

feature/manager.go

@@ -63,6 +63,9 @@ type Config struct {
 	// NoRouteBlinding unsets route blinding feature bits.
 	NoRouteBlinding bool
 
+	// NoTaprootOverlay unsets the taproot overlay channel feature bits.
+	NoTaprootOverlay bool
+
 	// CustomFeatures is a set of custom features to advertise in each
 	// set.
 	CustomFeatures map[Set][]lnwire.FeatureBit
@@ -192,6 +195,10 @@ func newManager(cfg Config, desc setDesc) (*Manager, error) {
 			raw.Unset(lnwire.Bolt11BlindedPathsOptional)
 			raw.Unset(lnwire.Bolt11BlindedPathsRequired)
 		}
+		if cfg.NoTaprootOverlay {
+			raw.Unset(lnwire.SimpleTaprootOverlayChansOptional)
+			raw.Unset(lnwire.SimpleTaprootOverlayChansRequired)
+		}
 		for _, custom := range cfg.CustomFeatures[set] {
 			if custom > set.Maximum() {
 				return nil, fmt.Errorf("feature bit: %v "+