Support nested classes in annotation classes

#KT-16962 In Progress

compiler/testData/diagnostics/tests/annotations/nestedClassesInAnnotations.kt

@@ -0,0 +1,23 @@
+// !LANGUAGE: +NestedClassesInAnnotations
+
+annotation class Foo {
+    class Nested
+
+    <!WRONG_MODIFIER_CONTAINING_DECLARATION!>inner<!> class Inner
+
+    enum class E { A, B }
+    object O
+    interface I
+    annotation class Anno(val e: E)
+
+    companion object {
+        val x = 1
+        const val y = ""
+    }
+
+
+    <!ANNOTATION_CLASS_MEMBER!>constructor(<!UNUSED_PARAMETER!>s<!>: Int) {}<!>
+    <!ANNOTATION_CLASS_MEMBER!>init {}<!>
+    <!ANNOTATION_CLASS_MEMBER!>fun function() {}<!>
+    <!ANNOTATION_CLASS_MEMBER!>val property get() = Unit<!>
+}