[NoArg] Reorganize module structure of NoArg plugin

plugins/noarg/testData/box/kt18245.kt

@@ -0,0 +1,45 @@
+// WITH_STDLIB
+
+annotation class NoArg
+
+sealed class Test {
+    abstract val test: String
+
+    @NoArg
+    data class Test1(override val test: String) : Test()
+
+    @NoArg
+    data class Test2(override val test: String) : Test()
+}
+
+fun box(): String {
+    Test::class.java.declaredConstructors.forEach { it.isAccessible = true }
+    Test.Test1::class.java.declaredConstructors.forEach { it.isAccessible = true }
+
+    val instance = Test.Test1::class.java.newInstance() // Error
+
+    Demo.Foo::class.java.newInstance()
+    Demo.Free::class.java.newInstance()
+
+    A.Free::class.java.newInstance()
+
+    return "OK"
+}
+
+@NoArg
+sealed class Demo(val name : String) {
+    @NoArg
+    class Free(name: String)
+
+    @NoArg
+    class Foo(name: String) : Demo(name)
+
+    @NoArg
+    class Bar(name: String) : Demo(name)
+}
+
+@NoArg
+abstract class A(val name: String) {
+    @NoArg
+    class Free(name: String) : A(name)
+}