Lambda to callable reference: inspection is optional depending on text length

(cherry picked from commit ce0c43c)

idea/testData/inspections/convertLambdaToReference/test.kt

@@ -0,0 +1,9 @@
+// Mostly tested as intention. Here we just test shouldSuggestToConvert()
+
+// Should suggest to convert
+class TheirWrapper(val x: Int)
+val x = { y: Int -> TheirWrapper(y) }
+
+// Should not suggest to convert (too long reference)
+fun foo(arg: TheirWrapper, convert: (TheirWrapper) -> String) = convert(arg)
+val y = foo(TheirWrapper(42)) { it.toString() }