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

js/js.translator/testData/box/jsQualifier/simple.kt

@@ -0,0 +1,15 @@
+// MODULE: lib
+// FILE: lib.kt
+@file:JsQualifier("a.b")
+package ab
+
+external fun c(): String
+
+external val d: String
+
+// MODULE: main(lib)
+// FILE: main.kt
+
+package main
+
+fun box() = ab.c() + ab.d