[AA] Add additional KDoc reference resolution tests for callables

- This adds KDoc reference resolution tests for callables in nested and
  inner classes, overloaded functions, and private callables.
- Private declarations are visible in KDoc from outside their containing
  classes. This is in line with K1 KDoc behavior.

^KTIJ-22324

analysis/analysis-api/testData/referenceResolve/kDoc/qualified/callables/functionFromInnerClass.kt

@@ -0,0 +1,10 @@
+class Foo {
+    inner class Inner {
+        fun foo() {}
+    }
+}
+
+/**
+ * [Foo.Inner.<caret>foo]
+ */
+fun usage() {}