Vulkan caching memory allocator.

[AshkanAliabadi]

Stack from ghstack:

• Vulkan descriptor and descriptor layout cache. #42642 Vulkan descriptor cache.
• Vulkan pipeline and pipeline layout cache. #42395 Vulkan pipeline cache.
• Vulkan caching memory allocator. #42274 Vulkan caching memory allocator.
• Vulkan (source and binary) shader and shader layout cache. #42325 Abstract GLSL source and SPIRV binary shaders in one common construct.
• Generic Vulkan object cache. #42394 Generic Vulkan resource cache.
• Move torch/csrc/utils/hash.h to c10/util/hash.h. #42503 Move torch/csrc/utils/hash.h to c10/util/hash.h.
• Refactor Vulkan context into its own files. Use RAII. #42273 Refactor Vulkan context into its own files. Use RAII.

[dr-ci]

💊 CI failures summary and remediations

As of commit de697af (more details on the Dr. CI page):

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• 1/1 failures possibly* introduced in this PR
  • 1/1 non-CircleCI failure(s)

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ci.pytorch.org: 1 failed

• Failed: pr/pytorch-linux-xenial-rocm3.5.1-py3.6

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