lnwallet: replace spew.Sdump with lnutils.SpewLogClosure for lazy evaluation

In this commit, we replace all instances of spew.Sdump in the lnwallet
package and its subpackages with lnutils.SpewLogClosure. This change
ensures that expensive debug dump operations are only performed when the
log level actually requires them.

lnwallet/chancloser/chancloser.go

@@ -10,7 +10,6 @@ import (
 	"github.com/btcsuite/btcd/chaincfg"
 	"github.com/btcsuite/btcd/txscript"
 	"github.com/btcsuite/btcd/wire"
-	"github.com/davecgh/go-spew/spew"
 	"github.com/lightningnetwork/lnd/channeldb"
 	"github.com/lightningnetwork/lnd/fn/v2"
 	"github.com/lightningnetwork/lnd/htlcswitch"
@@ -414,7 +413,7 @@ func (c *ChanCloser) initChanShutdown() (*lnwire.Shutdown, error) {
 		)
 
 		chancloserLog.Infof("Initiating shutdown w/ nonce: %v",
-			spew.Sdump(firstClosingNonce.PubNonce))
+			lnutils.SpewLogClosure(firstClosingNonce.PubNonce))
 	}
 
 	// Before closing, we'll attempt to send a disable update for the

lnwallet/chancloser/rbf_coop_transitions.go

@@ -9,7 +9,6 @@ import (
 	"github.com/btcsuite/btcd/chaincfg"
 	"github.com/btcsuite/btcd/mempool"
 	"github.com/btcsuite/btcd/wire"
-	"github.com/davecgh/go-spew/spew"
 	"github.com/lightningnetwork/lnd/fn/v2"
 	"github.com/lightningnetwork/lnd/input"
 	"github.com/lightningnetwork/lnd/labels"
@@ -799,7 +798,7 @@ func (l *LocalCloseStart) ProcessEvent(event ProtocolEvent,
 			l.RemoteDeliveryScript[:], absoluteFee)
 
 		chancloserLog.Infof("proposing closing_tx=%v",
-			spew.Sdump(closeTx))
+			lnutils.SpewLogClosure(closeTx))
 
 		// Now that we have our signature, we'll set the proper
 		// closingSigs field based on if the remote party's output is