Reflection: add KClassifier.createType

#KT-8998 In Progress

compiler/testData/codegen/box/reflection/methodsFromAny/typeToStringInnerGeneric.kt

@@ -0,0 +1,16 @@
+// WITH_REFLECT
+
+import kotlin.test.assertEquals
+
+class A<T1> {
+    inner class B<T2, T3> {
+        inner class C<T4>
+    }
+}
+
+fun foo(): A<Int>.B<Double, Float>.C<Long> = null!!
+
+fun box(): String {
+    assertEquals("A<kotlin.Int>.B<kotlin.Double, kotlin.Float>.C<kotlin.Long>", ::foo.returnType.toString())
+    return "OK"
+}