[ET Device Support] Define et_copy runtime h2d and d2h copy ops

[Gasoonjia]

Stack from ghstack (oldest at bottom):

• [ET Device Support] CUDA-native Qwen 3.5 MoE inference with device tensor pipeline #18788
• [ET Device Support] Extract shared device test utilities to reduce redundancy #18762
• [ET Device Support] Add device tensor helper functions to TensorPtr API #18761
• [ET Device Support] Add ExecutorchBackendConfig flags for skipping H2D/D2H copies #18760
• [ET Device Support] PropagateDevicePass inserts H2D/D2H copy ops at delegate boundaries #18730
• -> [ET Device Support] Define et_copy runtime h2d and d2h copy ops #18729
• [ET Device Support] Define AOT device copy ops registry #18728
• [ET Device Support] CudaAllocator: device memory allocator for CUDA backend #18477
• [ET Device Support] Module: allocate device memory for planned buffers #18476
• [ET Device Support] MemoryManager: add per-buffer device metadata #18475
• [ET Device Support] MethodMeta: expose per-buffer device placement API #18474
• [ET Device Support] DeviceMemoryBuffer RAII class for device memory lifetime management #18473
• [ET Device Support] Emitter reads non_const_buffer_device from graph meta #18472
• [ET Device Support] Device-aware memory planning: separate buffers per device type #18375
• [ET Device Support] Add NonConstBufferDevice schema for per-buffer device mapping #18330
• [ET Device Support] DeviceAllocator interface and DeviceAllocatorRegistry #17535
• [ET Device Support] Annotate device attributes of CUDA backend IO tensors cuda device #18080
• [ET Device Support] Parse device info from serialized tensor in tensor_parser #18328
• [ET Device Support] Propagate device info from TensorSpec into serialized Tensor #18079
• [executorch] Propagate device metadata from partitioner result onto TensorSpecs #18078

Implement C++ runtime kernels for device copy ops using DeviceAllocator:

• h2d_copy_out: infers device from out tensor, calls
  DeviceAllocator::copy_host_to_device
• d2h_copy_out: infers device from self tensor, calls
  DeviceAllocator::copy_device_to_host
• Registered via EXECUTORCH_LIBRARY macro

Differential Revision: D99636776

[pytorch-bot]

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❌ 64 New Failures

As of commit e80c75a with merge base b5ae0b9 ():

NEW FAILURES - The following jobs have failed:

• Build Presets / apple (pybind) / build (gh)
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  undefined reference to executorch::runtime::DeviceMemoryBuffer::create(unsigned long, executorch::runtime::etensor::DeviceType, signed char)'`
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