Move Hqq quantization to subclass

[jainapurva]

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[pytorch-bot]

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❌ 5 New Failures

As of commit 30dcc06 with merge base 5d1444b ():

NEW FAILURES - The following jobs have failed:

• PR Label Check / Check PR Labels (gh)
  Process completed with exit code 1.
• Run Regression Tests / test (CUDA 2.3, linux.g5.12xlarge.nvidia.gpu, torch==2.3.0, cuda, 12.1) / linux-job (gh)
  test/hqq/test_hqq_affine.py::TestHQQ::test_hqq_plain_8bit
• Run Regression Tests / test (CUDA 2.4, linux.g5.12xlarge.nvidia.gpu, torch==2.4.0, cuda, 12.1) / linux-job (gh)
  test/hqq/test_hqq_affine.py::TestHQQ::test_hqq_plain_8bit
• 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/hqq/test_hqq_affine.py::TestHQQ::test_hqq_plain_8bit
• Run Regression Tests / test-nightly (CUDA Nightly, linux.g5.12xlarge.nvidia.gpu, --pre torch --index-url https://downloa... / linux-job (gh)
  test/hqq/test_hqq_affine.py::TestHQQ::test_hqq_plain_8bit

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