[ET-VK] Generalize constant_pad_nd to support any storage type and packed dimension

[SS-JIA]

Stack from ghstack (oldest at bottom):

• [ET-VK] Buckify parakeet #18062
• [ET-VK][qlinear] Add bias support to q4gsw and dq8ca_q4gsw quantized linear ops #18061
• [ET-VK] Add conv1d shaders and dispatch for 1D convolution #18060
• [ET-VK] Implement missing Vulkan operators for Parakeet TDT model #18059
• [ET-VK] Add ANY_STORAGE support to argmax and argmin #18058
• [ET-VK] Add ANY_STORAGE support to embedding #18057
• [ET-VK] Add ANY_STORAGE support to repeat #18056
• [ET-VK] Add ANY_STORAGE support to native_layer_norm #18055
• [ET-VK] Add ANY_STORAGE support to softmax and log_softmax #18054
• [ET-VK] Add ANY_STORAGE support to expand_copy #18053
• [ET-VK] Add ANY_STORAGE support to arange and full #18052
• -> [ET-VK] Generalize constant_pad_nd to support any storage type and packed dimension #18051
• [ET-VK] Add symint infrastructure to VulkanBackend and ComputeGraph #18050
• [ET-VK] Add Vulkan backend support for Parakeet runner and export #18049
• [ET-VK][ez] Fix IndexError in Vulkan partitioner DtypeSetList/TensorRepSetList #18048

Replace the old pad_channel and pad_height_width shaders with generalized pad_buffer and pad_texture shaders that work with any storage type and packed dimension using BufferMetadata/TextureMetadata and indexing.glslh utilities.

Differential Revision: D95970168

[pytorch-bot]

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❌ 3 New Failures, 10 Pending

As of commit c8ef823 with merge base f09bd55 ():

NEW FAILURES - The following jobs have failed:

• pull / test-static-llama-qnn-linux (stories_260k_bc) / linux-job (gh)
  RuntimeError: Command docker exec -t 02e00f7168a67f11106d4468caa1e201132579498cd32b9473200fd82cc7c793 /exec failed with exit code 92
• Test CUDA Builds / export-model-cuda-artifact (nvidia, parakeet-tdt, quantized-int4-weight-only) / linux-job (gh)
  RuntimeError: Command docker exec -t f24c83318616d2348502d4ca1ab9ade7f37a1ef9f42bdd6c4c6efa2104e5508d /exec failed with exit code 1
• Test CUDA Builds / export-model-cuda-artifact (openai, whisper-large-v3-turbo, non-quantized) / linux-job (gh)
  RuntimeError: Command docker exec -t a0b748c47c45740e14eab3aeb8c0eb8f7113c449241d1b1a700e7d4567bcd976 /exec failed with exit code 1

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