Add device and dtype to storage. (#18749)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/18749
ghimport-source-id: 9026a037f5e11cdb9ccd386f4b6b5768b9c3259b
Stack from [ghstack](https://github.com/ezyang/ghstack):
* #18751 Disallow changing the device of a tensor via set_.
* #18750 Use non-legacy constructors for tensor deserialization.
* **#18749 Add device and dtype to storage.**
The goal here is to fix our serialization, which currently depends on the legacy constructors. Having dtype and device on Storage allows us to use the non-legacy constructors.
This fits somewhat along our goal of removing Storage, my having Storage act like a Tensor.
Differential Revision: D14729516
fbshipit-source-id: bf4a3e8669ad4859931f4a3fa56df605cbc08dcb
