Rework resolving references and namespace creation in modules (#4695)

- Properties of namespace objects are ordered in lexical order
- The namespace object is created and imports are bound during linking phase
- Namespace imports are changed to read-only
- Reduced memory consumption

JerryScript-DCO-1.0-Signed-off-by: Zoltan Herczeg zherczeg.u-szeged@partner.samsung.com

tests/jerry/es.next/module-export-09.mjs

@@ -0,0 +1,25 @@
+/* Copyright JS Foundation and other contributors, http://js.foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/* Test sorting order */
+
+export let
+  c = 4,
+  bc = 3,
+  ddd = 6,
+  dddd = 7,
+  bb = 2,
+  dd = 5,
+  a = 1