[vulkan] add support for quantized tensors (#81491)
for T121381630
added support for int textures/quantized tensors
wrote shaders for the above and had to modify certain files in the pytorch codebase to allow for vulkan tensors
Differential Revision: [D37314225](https://our.internmc.facebook.com/intern/diff/D37314225/)
**NOTE FOR REVIEWERS**: This PR has internal Facebook specific changes or comments, please review them on [Phabricator](https://our.internmc.facebook.com/intern/diff/D37314225/)!
Pull Request resolved: https://github.com/pytorch/pytorch/pull/81491
Approved by: https://github.com/salilsdesai
