[LC] move light class related tests to one directory

compiler/testData/asJava/lightClasses/ultraLightScripts/InnerClasses.kts

@@ -0,0 +1,11 @@
+class Bar(val a: Int) {
+    val b: Int = { 0 }()
+
+    fun getAPlusB() = a + b
+
+    class Baz {
+        fun doSomething() {
+
+        }
+    }
+}