add the function specialization for promote with ITensorListRef (#87756)
Fixes [#87684](https://github.com/pytorch/pytorch/issues/87684)
It's due to a new tensor list type is introduced as `ITensorListRef`. We need the function specialization for `prioritize` and `cached_cast` for this new tensor list type.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/87756
Approved by: https://github.com/jgong5, https://github.com/ezyang
