Move gemlite layout to prototype/dtypes

[jainapurva]

This pull request moves GemlitePackedLayout and its implementation from torchao/dtypes/uintx/gemlite_layout.py to torchao/prototype/dtypes/uintx/gemlite_layout.py, and exposed it via torchao.prototype.dtypes while maintaining BC at torchao.prototype.dtypes.uintx with a deprecation warning for future torchao release.
Updates API documentation to reflect the changes

Reference Issue: #2752

[pytorch-bot]

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❌ 2 New Failures

As of commit 88e54be with merge base 17867e6 ():

NEW FAILURES - The following jobs have failed:

• Code Analysis with Ruff / build (3.9) (gh)
  Process completed with exit code 1.
• Run 1xH100 Tests / test (H100, linux.aws.h100, --pre torch torchvision torchaudio fbgemm-gpu-genai --index-url https... / linux-job (gh)
  RuntimeError: Command docker exec -t 3b5c9849994add73fc95bd95354fb40e0457e395a84a6d22dd8f6406684e3a5e /exec failed with exit code 1

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