Make Array.size() a function instead of a property

Also add a deprecated extension property to help migration. This is done to
unify getting size of arrays and collections

compiler/testData/codegen/box/enum/emptyEnumValuesValueOf.kt

@@ -1,7 +1,7 @@
 enum class Empty
 
 fun box(): String {
-    if (Empty.values().size != 0) return "Fail: ${Empty.values()}"
+    if (Empty.values().size() != 0) return "Fail: ${Empty.values()}"
 
     try {
         val found = Empty.valueOf("nonExistentEntry")