entc/gen: add the Exec(X) methods for BulkCreate

entc/gen/template/dialect/sql/create.tmpl

@@ -161,4 +161,17 @@ func ({{ $receiver }} *{{ $builder }}) SaveX(ctx context.Context) []*{{ $.Name }
 	}
 	return v
 }
+
+// Exec executes the query.
+func ({{ $receiver }} *{{ $builder }}) Exec(ctx context.Context) error {
+	_, err := {{ $receiver }}.Save(ctx)
+	return err
+}
+
+// ExecX is like Exec, but panics if an error occurs.
+func ({{ $receiver }} *{{ $builder }}) ExecX(ctx context.Context) {
+	if err := {{ $receiver }}.Exec(ctx); err != nil {
+		panic(err)
+	}
+}
 {{ end }}