Groupwise low bit LUT based model quantization.

[szyszyzys]

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❌ 3 New Failures, 1 Cancelled Job

As of commit 61cca5d with merge base 5239ce7 ():

NEW FAILURES - The following jobs have failed:

• Run Regression Tests / test (CPU 2.7, linux.4xlarge, torch==2.7.0 --index-url https://download.pytorch.org/whl/cpu, cpu) / linux-job (gh)
  test/quantization/pt2e/test_numeric_debugger.py::TestNumericDebuggerInfra::test_prepare_for_propagation_comparison
• Run Regression Tests / test (CUDA 2.7, linux.g5.12xlarge.nvidia.gpu, torch==2.7.0, cuda, 12.6) / linux-job (gh)
  test/quantization/pt2e/test_numeric_debugger.py::TestNumericDebuggerInfra::test_prepare_for_propagation_comparison
• Run TorchAO Experimental Tests / test-cpu-ops (linux.arm64.2xlarge) (gh)
  /home/ec2-user/actions-runner/_work/ao/ao/torchao/experimental/../../torchao/experimental/kernels/cpu/aarch64/bitpacking/bitpack.h:739:39: error: cannot convert ‘const int8x16_t’ to ‘uint8x16_t’

CANCELLED JOB - The following job was cancelled. Please retry:

• Run TorchAO Experimental Tests / test-cpu-ops (macos-14) (gh)
  ##[error]The operation was canceled.

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[metascroy]

The unit tests are failing here, and the PR needs to be broken up into smaller pieces.