Moved creation of additional items like special items for functions accepting lambda into LookupElementFactory to provide them in smart completion too

idea/idea-completion/testData/smart/HighOrderFunction.kt

@@ -0,0 +1,6 @@
+fun foo(p: (String, Char) -> Unit): String {}
+
+fun v: String = fo<caret>
+
+// EXIST: { lookupString:"foo", itemText: "foo", tailText: "(p: (String, Char) -> Unit) (<root>)", typeText:"String" }
+// EXIST: { lookupString:"foo", itemText: "foo", tailText: " { String, Char -> ... } (p: (String, Char) -> Unit) (<root>)", typeText:"String" }

idea/idea-completion/testData/smart/SAMExpected2.kt

@@ -0,0 +1,7 @@
+import java.util.Comparator
+
+var v: Comparator<String> = <caret>
+
+// EXIST: { itemText: "object: Comparator<String>{...}" }
+// EXIST: { lookupString: "Comparator", itemText: "Comparator", tailText: "(function: (T!, T!) -> Int) (java.util)", typeText: "Comparator<T>" }
+// EXIST: { lookupString: "Comparator", itemText: "Comparator", tailText: " { T, T -> ... } (function: (T!, T!) -> Int) (java.util)", typeText: "Comparator<T>" }