Add aoti_torch_item_bool and aoti_torch_assign_tensors_out shims

[larryliu0820]

Add two new shim implementations for the CUDA AOTI backend:

1. aoti_torch_item_bool: Extracts a boolean value from a 0D boolean tensor.
   Handles both CPU and CUDA tensors by using cudaPointerGetAttributes to
   determine the memory location and copying from device if needed.

2. aoti_torch_assign_tensors_out: Creates a new tensor view that shares the
   same underlying data as the source tensor. The new tensor has the same
   shape, strides, and dtype as the source.

Also adds:

• Declaration of aoti_torch_dtype_bool() in common_shims.h
• Unit tests for both new functions
• Update CMakeLists.txt with new test targets
• Update targets.bzl with new test targets

[larryliu0820]

Stack from ghstack (oldest at bottom):

• -> Add aoti_torch_item_bool and aoti_torch_assign_tensors_out shims #16345
• Add device type validation in aoti_torch_create_tensor_from_blob_v2 #16344
• Add whisper-cuda-debug build target #16343

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/16345

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❌ 4 New Failures, 1 Unrelated Failure

As of commit 9a7aa91 with merge base 78c6b42 ():

NEW FAILURES - The following jobs have failed:

• Lint / android-java-format / linux-job (gh)
• Lint / lintrunner / linux-job (gh)
  >>> Lint for backends/cuda/runtime/shims/tests/test_aoti_torch_item_bool.cpp:
• pull / test-samsung-models-linux / linux-job (gh)
  test_resnet50_fp16
• Test CUDA Builds / test-cuda-shims / linux-job (gh)
  RuntimeError: Command docker exec -t 2321c00a5e28ee08ca41ca0f4d91dca031d5216e33d1099baf3e9adada9f9d93 /exec failed with exit code 1

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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