[slimtensor] integration into backend

[Gasoonjia]

Stack from ghstack (oldest at bottom):

• -> [slimtensor] integration into backend #16565
• [slimtensor] Add from_etensor factory function for ETensor to SlimTensor conversion #16551
• rename slimtensor fiies to consistent with executorch files #16469
• [slimtensor] Add utility functions to common_shims_slim #16457
• [slimtensor] Add storage and device property getters to common_shims_slim #16455
• [slimtensor] Add common_shims_slim with basic property getters #16454
• [slimtensor] Add aoti_torch_item_bool for SlimTensor #16453
• [slimtensor] Add aoti_torch_assign_tensors_out for SlimTensor #16452
• [slimtensor] Add aoti_torch_copy_ for SlimTensor #16451
• [slimtensor] Add aoti_torch__reinterpret_tensor for SlimTensor #16450
• [slimtensor] Add aoti_torch_new_tensor_handle for SlimTensor #16449
• [slimtensor] Add aoti_torch_delete_tensor_object for SlimTensor #16448
• [slimtensor] Add SlimTensor-based aoti_torch_empty_strided #16447
• [slimtensor] Add SlimTensor-based aoti_torch_create_tensor_from_blob_v2 #16446
• [slimtensor] Add item() methods with CUDA and CPU support for scalar value extraction #16445
• [slimtensor] Add permute() and reshape() view operations #16444
• [slimtensor] Add as_strided() view operation for tensor reinterpretation #16443
• [slimtensor] Add from_blob() factory function for wrapping external memory #16442
• [slimtensor] Add non-owning storage mode for wrapping external memory #16441
• [slimtensor] Enable CUDA tensor copy #16440
• [slimtensor] Add CUDA slimtensor creation with basic functionality #16439
• [slimtensor] Add CUDA Storage with DeviceTraits and memory allocation #16438
• [slimtensor] Add CUDA DeviceType and extend Device class #16437
• [slimtensor] Add all required dtype support (Int8/16/32/64, Bool, BFloat16) #16399
• [slimtensor] Add factory functions for creating empty CPU tensors #16398

Differential Revision: D90606409

[pytorch-bot]

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/16565

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❌ 22 New Failures, 1 Unrelated Failure

As of commit 58b70ce with merge base 35eb01a ():

NEW FAILURES - The following jobs have failed:

• Lint / lintrunner / linux-job (gh)
  >>> Lint for backends/cuda/runtime/shims/tests/CMakeLists.txt:
• Test CUDA Builds / test-model-cuda-e2e (google, gemma-3-4b-it, non-quantized) / linux-job (gh)
  RuntimeError: Command docker exec -t c4c33035c5892a9ff5970f41be9f552ef71831ad0480e41485cc62c1f78703b7 /exec failed with exit code 2
• Test CUDA Builds / test-model-cuda-e2e (google, gemma-3-4b-it, quantized-int4-tile-packed) / linux-job (gh)
  RuntimeError: Command docker exec -t f9a92ed809302bbe5306389fd2c2b5da91fefc2a40c832ee63d411f5eb4539ce /exec failed with exit code 2
• Test CUDA Builds / test-model-cuda-e2e (mistralai, Voxtral-Mini-3B-2507, non-quantized) / linux-job (gh)
  RuntimeError: Command docker exec -t 1be2e29eb55a5f1b2e41a0e2c5a26448b46ec5390ae10dc32db1fc60b3db5a61 /exec failed with exit code 2
• Test CUDA Builds / test-model-cuda-e2e (mistralai, Voxtral-Mini-3B-2507, quantized-int4-tile-packed) / linux-job (gh)
  RuntimeError: Command docker exec -t 9225c83ac762ab3874b2c9a1575f3178a84dc4751125aad166a472468d41ce91 /exec failed with exit code 2
• Test CUDA Builds / test-model-cuda-e2e (mistralai, Voxtral-Mini-3B-2507, quantized-int4-weight-only) / linux-job (gh)
  RuntimeError: Command docker exec -t 9710640d368088cfb4bbc10e5e871c0a51f69e6d15ec7b6253d5ec063b0ad6ac /exec failed with exit code 2
• Test CUDA Builds / test-model-cuda-e2e (openai, whisper-large-v3-turbo, non-quantized) / linux-job (gh)
  RuntimeError: Command docker exec -t 1dfed907650218245809f09bd8d0e4e943db482ef4f0b7273af402155b6fbe56 /exec failed with exit code 2
• Test CUDA Builds / test-model-cuda-e2e (openai, whisper-large-v3-turbo, quantized-int4-tile-packed) / linux-job (gh)
  RuntimeError: Command docker exec -t 210053a7dda5a2556d45063f0e04c564ec5b836781307143cb58468cfb285882 /exec failed with exit code 2
• Test CUDA Builds / test-model-cuda-e2e (openai, whisper-large-v3-turbo, quantized-int4-weight-only) / linux-job (gh)
  RuntimeError: Command docker exec -t d9aedd06d7618aef119b97ce65feace7fb1ba296d0e92134c9a4ba9ff14fbb67 /exec failed with exit code 1
• Test CUDA Builds / test-model-cuda-e2e (openai, whisper-small, non-quantized) / linux-job (gh)
  RuntimeError: Command docker exec -t 74a42adb8e58c0f78a4583d48381fdf77836bcd594dd8db5ddced22813f53551 /exec failed with exit code 2
• Test CUDA Builds / test-model-cuda-e2e (openai, whisper-small, quantized-int4-tile-packed) / linux-job (gh)
  RuntimeError: Command docker exec -t a0be71f4cf1cb4920dbaf5a998ca97face71c5c5c5e5c3b9a53ff48f7c3ec11a /exec failed with exit code 2
• Test CUDA Builds / test-model-cuda-e2e (openai, whisper-small, quantized-int4-weight-only) / linux-job (gh)
  RuntimeError: Command docker exec -t 990d46a57a891a3b985eecfd0265353c8a0671d3d313c1d96b602181ac95840a /exec failed with exit code 2
• Test CUDA Builds / test-models-cuda (add_mul) / linux-job (gh)
  RuntimeError: Command docker exec -t 4ef8ef3159e5adb67466bfad8de365569822a97ecf6c5d4c62c39a8456b58d32 /exec failed with exit code 1
• Test CUDA Builds / test-models-cuda (add) / linux-job (gh)
  RuntimeError: Command docker exec -t 202847841cc15b8f037048ead3e638fbdc3e39362d3c648896d90b2bcf03d35f /exec failed with exit code 1
• Test CUDA Builds / test-models-cuda (conv1d) / linux-job (gh)
  RuntimeError: Command docker exec -t 66b1e21116d9438a7c7a6ddb21cb05af45507f05b903042c0e7c8a98fc4ec6bd /exec failed with exit code 1
• Test CUDA Builds / test-models-cuda (linear) / linux-job (gh)
  RuntimeError: Command docker exec -t cacfe76e3d654fb6634920fb19af22fa91c55152f108c6f0b91ab111c06cc1c2 /exec failed with exit code 1
• Test CUDA Builds / test-models-cuda (resnet18) / linux-job (gh)
  RuntimeError: Command docker exec -t 9cf5888c9cee2ebec8c1a4033ae26835d42bf588a1b0595b9d1d3db756dd686d /exec failed with exit code 1
• Test CUDA Builds / test-models-cuda (sdpa) / linux-job (gh)
  RuntimeError: Command docker exec -t 34b97529c0d3737eab0700e31e2818d91e5ff2d66cd7735f7ae5e7dc17b0b32d /exec failed with exit code 1
• Test CUDA Builds / unittest-cuda / linux-job (gh)
  RuntimeError: Command docker exec -t a642c07a7b7d2c414f945508b6eef4c73aead327f233825dcbd5673a8cdb0e79 /exec failed with exit code 1
• Test Metal Backend / test-model-metal-e2e (mistralai, Voxtral-Mini-3B-2507, non-quantized) / macos-job (gh)
  /Users/ec2-user/runner/_work/executorch/executorch/pytorch/executorch/backends/apple/metal/runtime/metal_backend.cpp:558:33: error: no member named 'cleanup_tensor_metadata' in namespace 'executorch::backends::aoti'
• Test Metal Backend / test-model-metal-e2e (openai, whisper-large-v3-turbo, non-quantized) / macos-job (gh)
  /Users/ec2-user/runner/_work/executorch/executorch/pytorch/executorch/backends/apple/metal/runtime/metal_backend.cpp:558:33: error: no member named 'cleanup_tensor_metadata' in namespace 'executorch::backends::aoti'
• Test Metal Backend / test-model-metal-e2e (openai, whisper-small, non-quantized) / macos-job (gh)
  /Users/ec2-user/runner/_work/executorch/executorch/pytorch/executorch/backends/apple/metal/runtime/metal_backend.cpp:558:33: error: no member named 'cleanup_tensor_metadata' in namespace 'executorch::backends::aoti'

UNSTABLE - The following job is marked as unstable, possibly due to flakiness on trunk:

• pull / android / run-emulator (gh) (#16137)
  Timeout waiting for emulator to boot.

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