[vulkan] implement quantize per tensor (#81492)
for T121382131
implement quantize_per_tensor function and corresponding shader
Differential Revision: [D37318641](https://our.internmc.facebook.com/intern/diff/D37318641/)
Pull Request resolved: https://github.com/pytorch/pytorch/pull/81492
Approved by: https://github.com/salilsdesai
