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/classObjectInEnum.kt

@@ -13,7 +13,7 @@ fun box(): String {
     if (Game.foo() != Game.ROCK) return "Fail 1"
     // TODO: fix initialization order and uncomment (KT-5761)
     // if (Game.bar != Game.PAPER) return "Fail 2: ${Game.bar}"
-    if (Game.values().size != 3) return "Fail 3"
+    if (Game.values().size() != 3) return "Fail 3"
     if (Game.valueOf("SCISSORS") != Game.SCISSORS) return "Fail 4"
     return "OK"
 }

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")