lnrpc: add session ID to tower session info

This will be used in the itest added in an upcoming commit so that we can
test the TerminateSession command.

lnrpc/wtclientrpc/wtclient.pb.go

@@ -545,6 +545,8 @@ type TowerSession struct {
 	// The fee rate, in satoshis per vbyte, that will be used by the watchtower for
 	// the justice transaction in the event of a channel breach.
 	SweepSatPerVbyte uint32 `protobuf:"varint,5,opt,name=sweep_sat_per_vbyte,json=sweepSatPerVbyte,proto3" json:"sweep_sat_per_vbyte,omitempty"`
+	// The ID of the session.
+	Id []byte `protobuf:"bytes,6,opt,name=id,proto3" json:"id,omitempty"`
 }
 
 func (x *TowerSession) Reset() {
@@ -615,6 +617,13 @@ func (x *TowerSession) GetSweepSatPerVbyte() uint32 {
 	return 0
 }
 
+func (x *TowerSession) GetId() []byte {
+	if x != nil {
+		return x.Id
+	}
+	return nil
+}
+
 type Tower struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -1189,7 +1198,7 @@ var file_wtclientrpc_wtclient_proto_rawDesc = []byte{
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@@ -1204,6 +1213,7 @@ var file_wtclientrpc_wtclient_proto_rawDesc = []byte{
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