Add intentions to convert nullable <--> lateinit var #KT-12743 Fixed

idea/testData/intentions/convertNullablePropertyToLateinit/delegate.kt

@@ -0,0 +1,11 @@
+// IS_APPLICABLE: false
+import kotlin.reflect.KProperty
+
+class C {
+    <caret>var foo by Delegate
+}
+
+object Delegate {
+    operator fun getValue(instance: Any?, property: KProperty<*>): String = ""
+    operator fun setValue(instance: Any?, property: KProperty<*>, value: String) {}
+}