Quick-fix for header without implementation + a set of tests #KT-14908 Fixed

idea/testData/multiModuleQuickFix/class/header/header.kt.after

@@ -0,0 +1,15 @@
+// "Create header class implementation for platform JVM" "true"
+
+header class My {
+    fun foo(param: String): Int
+
+    fun String.bar(y: Double): Boolean
+
+    fun baz(): Unit
+
+    constructor(flag: Boolean)
+
+    val isGood: Boolean
+
+    var status: Int
+}