[ET-VK] Adding MemoryPool class to allocate chunks of memory and use it for smaller allocations.

[trviv]

Stack from ghstack (oldest at bottom):

• -> [ET-VK] Adding MemoryPool class to allocate chunks of memory and use it for smaller allocations. #7338
• [ET-VK] Replace Uniform buffers with push constants for copy op #7267
• [ET-VK] Replace Uniform buffers with push constants for permute op #7231
• [ET-VK] Replace Uniform buffers with push constants for binary op #7230

Differential Revision: D67220112

[pytorch-bot]

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❌ 3 New Failures

As of commit 8d4e910 with merge base e94c2ff ():

NEW FAILURES - The following jobs have failed:

• Check Labels / Check labels (gh)
  RuntimeError: Error checking labels: PR does not have required labels
• Lint / lintrunner / linux-job (gh)
  >>> Lint for backends/vulkan/runtime/utils/MemoryPool.h:
• pull / unittest / linux / linux-job (gh)
  /pytorch/executorch/backends/vulkan/../../../executorch/backends/vulkan/runtime/graph/ops/DispatchNode.h:49:12: error: call to implicitly-deleted default constructor of 'vkcompute::PushConstantDataInfo::Payload'

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