Deserialize annotations on classes

First version, not all kinds of value arguments of annotations are supported

compiler/testData/loadKotlin/annotations/classes/NestedClass.txt

@@ -0,0 +1,17 @@
+package test
+
+internal final annotation class Anno : jet.Annotation {
+    /*primary*/ public constructor Anno()
+}
+
+internal final class Class {
+    /*primary*/ public constructor Class()
+    
+    test.Anno() internal final inner class Inner {
+        /*primary*/ public constructor Inner()
+    }
+    
+    test.Anno() internal final class Nested {
+        /*primary*/ public constructor Nested()
+    }
+}