KT-38027 Support Code Vision feature in Kotlin

idea/testData/codeInsight/codeVision/InterfaceAbstractMethodImplementation.kt

@@ -0,0 +1,16 @@
+// MODE: inheritors
+
+<# block [ 1 Implementation] #>
+interface SomeInterface {
+<# block [     2 Implementations] #>
+    fun interfaceMethodA()
+}
+<# block [ 1 Inheritor] #>
+open class SomeClass : SomeInterface {
+<# block [     1 Override] #>
+    override fun interfaceMethodA() {} // <== (1)
+}
+
+class SomeDerivedClass : SomeClass() {
+    override fun interfaceMethodA() {} // <== (2)
+}