[FIR2IR] Lookup for nested classes in scope in Fir2IrLazyClass

^KT-55269 Fixed

compiler/testData/ir/irText/stubs/javaNestedClassesInHierarchy.kt

@@ -0,0 +1,19 @@
+// TARGET_BACKEND: JVM
+// FIR_IDENTICAL
+// DUMP_EXTERNAL_CLASS: Base, Derived
+// FILE: javaNestedClassesInHierarchy.kt
+
+fun test() {}
+
+// FILE: Base.java
+public class Base {
+    public class BaseInner {}
+    public static class BaseNested {}
+}
+
+// FILE: Derived.java
+
+public class Derived extends Base {
+    public class DerivedInner extends BaseInner {}
+    public static class DerivedNested extends BaseNested {}
+}