[NoArg] Reorganize module structure of NoArg plugin

plugins/noarg/testData/box/kt18668.kt

@@ -0,0 +1,22 @@
+// WITH_STDLIB
+
+annotation class NoArg
+
+@NoArg
+class AuthenticationConfiguration(tokenExpiresIn: Long) {
+    var tokenExpiryDate: String?
+
+    init {
+        tokenExpiryDate = tokenExpiresIn.toString()
+    }
+}
+
+fun box(): String {
+    val instance = AuthenticationConfiguration::class.java.newInstance()
+
+    if (instance.tokenExpiryDate != null) {
+        return "Initializer invoked"
+    }
+
+    return "OK"
+}