Add image sampler.

[AshkanAliabadi]

Stack from ghstack:

• Add Vulkan op Add. #44017 Add Vulkan op Add.
• Add Vulkan Tensor factory. #44016 Add Vulkan Tensor factory.
• Add Vulkan Tensor. #44015 Add Vulkan Tensor.
• Add fence. #45148 Add fence.
• Add image sampler. #45037 Add image sampler.
• Redo Vulkan command and descriptor pools. #44496 Redo Vulkan command and descriptor pools.
• Add architectural support for multi-GPU. #44059 Add architectural support for multi-GPU.
• Minor touchups. #44317 Minor touchups.

Differential Revision: D23820824

[dr-ci]

💊 CI failures summary and remediations

As of commit 8b1910a (more details on the Dr. CI page):

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• 1/1 failures introduced in this PR

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XLA failure

Job pytorch_xla_linux_bionic_py3_6_clang9_build is failing. Please create an issue with title prefixed by [PT_BREAK] in pytorch/xla and link to to this PR. If you have questions, please reach out to @ailzhang / @dlibenzi / @JackCaoG.

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@@                     Coverage Diff                      @@
##             gh/AshkanAliabadi/54/base   #45037   +/-   ##
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  Coverage                             ?   67.84%           
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  Files                                ?      384           
  Lines                                ?    49977           
  Branches                             ?        0           
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  Hits                                 ?    33906           
  Misses                               ?    16071           
  Partials                             ?        0           

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