KT-12877: serialize information about file annotations. For each top-level declaration store containing file. Use this information to properly handle file-targeted JsModule.

js/js.translator/testData/box/jsModule/externalClass.js

@@ -0,0 +1,10 @@
+define("lib", [], function() {
+    function A(x) {
+        this.x = x;
+    }
+    A.prototype.foo = function (y) {
+        return this.x + y;
+    };
+
+    return A;
+});