[AA K2] implement symbol pointers for classes and objects

^KT-54311

analysis/analysis-api/testData/symbols/symbolByPsi/outerAndInnerClasses.kt

@@ -7,6 +7,17 @@ class X<T> {
         class U<T4> {
             inner class K<T5>
             class C<T6>
+            class X<T> {
+                inner class Y<T1>
+                class Z<T2>
+
+                fun <T3> foo() {
+                    class U<T4> {
+                        inner class K<T5>
+                        class C<T6>
+                    }
+                }
+            }
         }
     }
 }