add deprecation warning to torchao.autoquant

[vkuzo]

Summary:

Context: #3739

Test Plan:

CI

Also,

>>> torchao.autoquant(m)
/home/dev/.conda/envs/pt_nightly/lib/python3.12/site-packages/torch/utils/_contextlib.py:124: FutureWarning: torchao.autoquant is deprecated and will be removed in a future release. For more information, see: https://github.c
om/pytorch/ao/issues/3739
  return func(*args, **kwargs)
Linear(in_features=4, out_features=4, bias=True)

[pytorch-bot]

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❌ 1 New Failure

As of commit bcb8aae with merge base 8940de9 ():

NEW FAILURE - The following job has failed:

• Run 1xH100 Tests / test (H100, linux.aws.h100, --pre torch torchvision torchaudio mslk --index-url https://download.... / linux-job (gh)
  test/integration/test_load_and_run_checkpoint.py::TestLoadAndRunCheckpoint::test_single_linear_model_info3

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