rename slimtensor fiies to consistent with executorch files

[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] Introduce CUDA guard to aoti/slim/cuda #16724
• [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

This diff updates the slimtensor file names to follow ET style (use under_score instead of Camel).
Note that we keep the c10 files as Camel since et/c10 files are also in Camel Case.

Differential Revision: D90143740

[pytorch-bot]

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❌ 21 New Failures

As of commit 6c88338 with merge base c7c4073 ():

NEW FAILURES - The following jobs have failed:

• Lint / lintrunner / linux-job (gh)
  >>> Lint for backends/cuda/runtime/shims/memory_slim.cpp:
• Test CUDA Builds / test-model-cuda-e2e (google, gemma-3-4b-it, non-quantized) / linux-job (gh)
  undefined reference to aoti_torch_get_device_type'`
• Test CUDA Builds / test-model-cuda-e2e (google, gemma-3-4b-it, quantized-int4-tile-packed) / linux-job (gh)
  undefined reference to aoti_torch_get_device_type'`
• Test CUDA Builds / test-model-cuda-e2e (mistralai, Voxtral-Mini-3B-2507, non-quantized) / linux-job (gh)
  undefined reference to aoti_torch_get_device_type'`
• Test CUDA Builds / test-model-cuda-e2e (mistralai, Voxtral-Mini-3B-2507, quantized-int4-tile-packed) / linux-job (gh)
  undefined reference to aoti_torch_get_device_type'`
• Test CUDA Builds / test-model-cuda-e2e (mistralai, Voxtral-Mini-3B-2507, quantized-int4-weight-only) / linux-job (gh)
  undefined reference to aoti_torch_get_device_type'`
• Test CUDA Builds / test-model-cuda-e2e (nvidia, parakeet-tdt, non-quantized) / linux-job (gh)
  undefined reference to aoti_torch_get_device_type'`
• Test CUDA Builds / test-model-cuda-e2e (openai, whisper-large-v3-turbo, non-quantized) / linux-job (gh)
  undefined reference to aoti_torch_get_device_type'`
• Test CUDA Builds / test-model-cuda-e2e (openai, whisper-large-v3-turbo, quantized-int4-tile-packed) / linux-job (gh)
  undefined reference to aoti_torch_get_device_type'`
• Test CUDA Builds / test-model-cuda-e2e (openai, whisper-large-v3-turbo, quantized-int4-weight-only) / linux-job (gh)
  undefined reference to aoti_torch_get_device_type'`
• Test CUDA Builds / test-model-cuda-e2e (openai, whisper-small, non-quantized) / linux-job (gh)
  undefined reference to aoti_torch_get_device_type'`
• Test CUDA Builds / test-model-cuda-e2e (openai, whisper-small, quantized-int4-tile-packed) / linux-job (gh)
  undefined reference to aoti_torch_get_device_type'`
• Test CUDA Builds / test-model-cuda-e2e (openai, whisper-small, quantized-int4-weight-only) / linux-job (gh)
  undefined reference to aoti_torch_get_device_type'`
• Test CUDA Builds / test-models-cuda (add_mul) / linux-job (gh)
  undefined reference to aoti_torch_get_device_type'`
• Test CUDA Builds / test-models-cuda (add) / linux-job (gh)
  undefined reference to aoti_torch_get_device_type'`
• Test CUDA Builds / test-models-cuda (conv1d) / linux-job (gh)
  undefined reference to aoti_torch_get_device_type'`
• Test CUDA Builds / test-models-cuda (linear) / linux-job (gh)
  undefined reference to aoti_torch_get_device_type'`
• Test CUDA Builds / test-models-cuda (resnet18) / linux-job (gh)
  undefined reference to aoti_torch_get_device_type'`
• Test CUDA Builds / test-models-cuda (sdpa) / linux-job (gh)
  undefined reference to aoti_torch_get_device_type'`
• Test CUDA Builds / unittest-cuda / linux-job (gh)
  undefined reference to aoti_torch_get_device_type'`
• Test Metal Backend / test-model-metal-e2e (openai, whisper-large-v3-turbo, non-quantized) / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1

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