JS: add support of JsQualifier annotation. See KT-15905

js/js.translator/testData/box/jsQualifier/classes.js

@@ -0,0 +1,16 @@
+var pkg = function() {
+    function C() {
+    }
+    C.prototype.o = function() {
+        return "O";
+    };
+    function D() {
+    }
+    D.prototype.k = function() {
+        return "K";
+    };
+    C.D = D;
+    return {
+        C: C
+    };
+}();