KT-2697 Prohibit enum inheritance

#KT-2697 Fixed

compiler/testData/diagnostics/tests/enum/enumInheritance.kt

@@ -0,0 +1,11 @@
+// FILE: test.kt
+enum class MyEnum(): <!CLASS_IN_SUPERTYPE_FOR_ENUM!>MyClass<!>() {}
+enum class MyEnum2(): MyTrait {}
+enum class MyEnum3(): <!INVISIBLE_MEMBER, CLASS_IN_SUPERTYPE_FOR_ENUM, FINAL_SUPERTYPE!>MyEnumBase<!>() {}
+
+open class MyClass() {}
+
+enum class MyEnumBase() {}
+
+trait MyTrait {}
+