[Vulkan] Add Override Mechanism to Shader Registry (#91917)
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Setting overrides in the Vulkan Shader Registry will be used with the Op Benchmark Tool to benchmark different shaders on different devices.
Differential Revision: [D41738945](https://our.internmc.facebook.com/intern/diff/D41738945/)
Pull Request resolved: https://github.com/pytorch/pytorch/pull/91917
Approved by: https://github.com/mcr229
