Intentions: 'Implement abstract member' (Kotlin -> Kotlin)

#KT-8467 In Progress

idea/testData/intentions/implementAbstractMember/function/enumClass.kt

@@ -0,0 +1,9 @@
+// WITH_RUNTIME
+// DISABLE-ERRORS
+interface T<X> {
+    fun <caret>foo(x: X): X
+}
+
+enum class E : T<Int> {
+    A, B, C
+}