remove typed StorageImpl::data() and StorageImpl::unsafe_data() (#98219)
Typed data will now only be a tensor level concept.
Differential Revision: [D44629941](https://our.internmc.facebook.com/intern/diff/D44629941/)
Pull Request resolved: https://github.com/pytorch/pytorch/pull/98219
Approved by: https://github.com/ezyang
