Move tensor_flatten/unflatten from AQT -> TensorAOBaseClass

[jainapurva]

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[pytorch-bot]

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❌ 11 New Failures, 1 Unrelated Failure

As of commit 154be29 with merge base 70be245 ():

NEW FAILURES - The following jobs have failed:

• Code Analysis with Ruff / build (3.9) (gh)
  Process completed with exit code 1.
• Run Float8 Tests / test (SM-89, linux.g6.4xlarge.experimental.nvidia.gpu, --pre torch==2.7.0.dev20250122 --index-url... / linux-job (gh)
  test/float8/test_base.py::TestFloat8Linear::test_quantize
• Run Regression Tests / test (CPU 2.3, linux.4xlarge, torch==2.3.0 --index-url https://download.pytorch.org/whl/cpu, cpu) / linux-job (gh)
  test/quantization/test_quant_api.py::TestQuantFlow::test_dynamic_quant_gpu_singleline
• Run Regression Tests / test (CPU 2.4, linux.4xlarge, torch==2.4.0 --index-url https://download.pytorch.org/whl/cpu, cpu) / linux-job (gh)
  test/quantization/test_quant_api.py::TestQuantFlow::test_quantized_tensor_subclass_8da4w_mapping_type1
• Run Regression Tests / test (CPU 2.5.1, linux.4xlarge, torch==2.5.1 --index-url https://download.pytorch.org/whl/cpu, cpu) / linux-job (gh)
  test/quantization/test_quant_api.py::TestQuantFlow::test_quantized_tensor_subclass_8da4w_mapping_type1
• Run Regression Tests / test (CUDA 2.3, linux.g5.12xlarge.nvidia.gpu, torch==2.3.0, cuda, 12.1) / linux-job (gh)
  test/sparsity/test_marlin.py::SparseMarlin24::test_quant_sparse_marlin_layout_eager
• Run Regression Tests / test (CUDA 2.4, linux.g5.12xlarge.nvidia.gpu, torch==2.4.0, cuda, 12.1) / linux-job (gh)
  test/sparsity/test_marlin.py::SparseMarlin24::test_quant_sparse_marlin_layout_eager
• Run Regression Tests / test (CUDA 2.5.1, linux.g5.12xlarge.nvidia.gpu, torch==2.5.1 --index-url https://download.pytorch... / linux-job (gh)
  test/sparsity/test_marlin.py::SparseMarlin24::test_quant_sparse_marlin_layout_eager
• Run Regression Tests / test-nightly (CPU Nightly, linux.4xlarge, --pre torch==2.7.0.dev20250122 --index-url https://down... / linux-job (gh)
  test/quantization/test_quant_api.py::TestQuantFlow::test_quantized_tensor_subclass_8da4w_mapping_type1
• Run Regression Tests / test-nightly (CUDA Nightly, linux.g5.12xlarge.nvidia.gpu, --pre torch==2.7.0.dev20250122 --index-... / linux-job (gh)
  test/sparsity/test_marlin.py::SparseMarlin24::test_quant_sparse_marlin_layout_eager
• Run TorchAO Experimental Tests / test (macos-14) (gh)
  test_export_compile_aoti

BROKEN TRUNK - The following job failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• Run Float8 Tests / test (H100, linux.aws.h100, --pre torch torchvision torchaudio --index-url https://download.pytor... / linux-job (gh) (trunk failure)

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