multi: refactor to not use session.MacaroonRecipe outside the package

In this commit, we refactor various uses of the session.MacaroonRecipe
type outside of the session package. This is to decouple the baking of a
super macaroon from the sessions package and will help avoid import
cycles in future.

accounts/rpcserver.go

@@ -87,12 +87,10 @@ func (s *RPCServer) CreateAccount(ctx context.Context,
 		fmt.Sprintf("%s %x", CondAccount, account.ID[:]),
 	)
 
-	macHex, err := s.superMacBaker(ctx, macRootKey, &session.MacaroonRecipe{
-		Permissions: MacaroonPermissions,
-		Caveats: []macaroon.Caveat{{
-			Id: []byte(accountCaveat),
-		}},
-	})
+	macHex, err := s.superMacBaker(
+		ctx, macRootKey, MacaroonPermissions,
+		[]macaroon.Caveat{{Id: []byte(accountCaveat)}},
+	)
 	if err != nil {
 		return nil, fmt.Errorf("error baking account macaroon: %w", err)
 	}

session/interface.go

@@ -74,7 +74,7 @@ type Session struct {
 
 // MacaroonBaker is a function type for baking a super macaroon.
 type MacaroonBaker func(ctx context.Context, rootKeyID uint64,
-	recipe *MacaroonRecipe) (string, error)
+	perms []bakery.Op, caveats []macaroon.Caveat) (string, error)
 
 // NewSession creates a new session with the given user-defined parameters.
 func NewSession(id ID, localPrivKey *btcec.PrivateKey, label string, typ Type,

session_rpcserver.go

@@ -424,11 +424,7 @@ func (s *sessionRpcServer) resumeSession(ctx context.Context,
 	})
 
 	mac, err := s.cfg.superMacBaker(
-		ctx, sess.MacaroonRootKey,
-		&session.MacaroonRecipe{
-			Permissions: permissions,
-			Caveats:     caveats,
-		},
+		ctx, sess.MacaroonRootKey, permissions, caveats,
 	)
 	if err != nil {
 		log.Debugf("Not resuming session %x. Could not bake "+

terminal.go

@@ -69,6 +69,7 @@ import (
 	"google.golang.org/grpc/test/bufconn"
 	"google.golang.org/protobuf/encoding/protojson"
 	"gopkg.in/macaroon-bakery.v2/bakery"
+	"gopkg.in/macaroon.v2"
 )
 
 const (
@@ -430,11 +431,10 @@ func (g *LightningTerminal) start(ctx context.Context) error {
 	}
 
 	superMacBaker := func(ctx context.Context, rootKeyID uint64,
-		recipe *session.MacaroonRecipe) (string, error) {
+		perms []bakery.Op, caveats []macaroon.Caveat) (string, error) {
 
 		return litmac.BakeSuperMacaroon(
-			ctx, g.basicClient, rootKeyID,
-			recipe.Permissions, recipe.Caveats,
+			ctx, g.basicClient, rootKeyID, perms, caveats,
 		)
 	}