[NoArg] Reorganize module structure of NoArg plugin

plugins/noarg/testData/diagnostics/innerClass.kt

@@ -0,0 +1,14 @@
+annotation class NoArg
+
+class Outer {
+    @NoArg
+    inner class <!NOARG_ON_INNER_CLASS!>Inner<!>(val b: Any)
+}
+
+fun local() {
+    @NoArg
+    class <!NOARG_ON_LOCAL_CLASS!>Local<!>(val l: Any) {
+        @NoArg
+        inner class <!NOARG_ON_INNER_CLASS!>InnerLocal<!>(val x: Any)
+    }
+}