[NoArg] Reorganize module structure of NoArg plugin

plugins/noarg/testData/box/kt18667.kt

@@ -0,0 +1,14 @@
+// WITH_STDLIB
+
+annotation class NoArg
+
+@NoArg
+class Foo(val s1: String) {
+    val s2: String = ""
+    val l: List<String> = listOf()
+}
+
+fun box(): String {
+    val instance = Foo::class.java.newInstance()
+    return "OK"
+}