litd: register tapd as aux component of lnd

This commit represents the main integration between lnd running in
integrated mode and tapd providing auxiliary components for custom
channels.

Author: guggero

go.mod

@@ -148,7 +148,6 @@ require (
 	github.com/lightninglabs/neutrino/cache v1.1.2 // indirect
 	github.com/lightningnetwork/lightning-onion v1.2.1-0.20240712235311-98bd56499dfb // indirect
 	github.com/lightningnetwork/lnd/clock v1.1.1 // indirect
-	github.com/lightningnetwork/lnd/fn v1.2.1 // indirect
 	github.com/lightningnetwork/lnd/healthcheck v1.2.5 // indirect
 	github.com/lightningnetwork/lnd/queue v1.1.1 // indirect
 	github.com/lightningnetwork/lnd/sqldb v1.0.4 // indirect