Add copyright header to files in torchao folder

[jainapurva]

Stack from ghstack (oldest at bottom):

• Add copyright header to files in tutorials folder #1898
• -> Add copyright header to files in torchao folder #1897
• Add copyright header to files in test folder #1896
• Add copyright header to files in scripts folder #1895
• Add copyright header to files in examples folder #1894
• Add copyright header to files in docs folder #1893
• Add copyright header to files in benchmarks folder #1892
• Add pre-commit to check copyright-header #1891

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/ao/1897

• 📄 Preview Python docs built from this PR

Note: Links to docs will display an error until the docs builds have been completed.

❌ 7 New Failures, 1 Pending

As of commit 0a976bd with merge base f38c272 ():

NEW FAILURES - The following jobs have failed:

• Run Float8 Tests / test (SM-89, linux.g6.4xlarge.experimental.nvidia.gpu, --pre torch --index-url https://download.p... / linux-job (gh)
  /pytorch/ao/torchao/csrc/cuda/rowwise_scaled_linear_sparse_cutlass/rowwise_scaled_linear_sparse_cutlass_e5m2e4m3.h:5:3: error: invalid preprocessing directive #LICENSE
• Run Float8nocompile Tests / test (SM-89, linux.g6.4xlarge.experimental.nvidia.gpu, --pre torch --index-url https://download.p... / linux-job (gh)
  /pytorch/ao/torchao/csrc/cuda/cutlass_extensions/common.h:5:3: error: invalid preprocessing directive #LICENSE
• Run Regression Tests / test (CUDA 2.3, linux.g5.12xlarge.nvidia.gpu, torch==2.3.0, cuda, 12.1) / linux-job (gh)
  /pytorch/ao/torchao/csrc/cuda/cutlass_extensions/common.h:5:3: error: invalid preprocessing directive #LICENSE
• Run Regression Tests / test (CUDA 2.4, linux.g5.12xlarge.nvidia.gpu, torch==2.4.0, cuda, 12.1) / linux-job (gh)
  /pytorch/ao/torchao/csrc/cuda/cutlass_extensions/common.h:5:3: error: invalid preprocessing directive #LICENSE
• 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)
  /pytorch/ao/torchao/csrc/cuda/cutlass_extensions/common.h:5:3: error: invalid preprocessing directive #LICENSE
• Run Regression Tests / test-nightly (CUDA Nightly, linux.g5.12xlarge.nvidia.gpu, --pre torch --index-url https://downloa... / linux-job (gh)
  /pytorch/ao/torchao/csrc/cuda/rowwise_scaled_linear_sparse_cutlass/rowwise_scaled_linear_sparse_cutlass_e5m2e5m2.h:5:3: error: invalid preprocessing directive #LICENSE
• Run TorchAO Experimental Tests / test-mps-ops (macos-m1-stable) (gh)
  ModuleNotFoundError: No module named 'importlib_metadata'

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