feat(ngRepeat): expose the iterating properties over the alias

Expose the properties `$index`, `$first`, `$middle`, `$last`, `$odd` and `$even` as part of the alias

Closes #9582
I understand this, but I do not want to break https://github.com/angular/angular.js/pull/9622/files#diff-360c2ce98ed0ad852cb86146eae935f3R523