[Fix] KVCache: change cuda kernel's namespace

[DwyaneShi]

Pull Request Description

Change cuda kernel's namespace to avoid conflicts with vLLM's.

Related Issues

Resolves: #[Insert issue number(s)]

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[gemini-code-assist]

Summary of Changes

Hello @DwyaneShi, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses a potential naming conflict by changing the namespace of the CUDA kernel extension. The changes ensure that the aibrix_kvcache module's internal C/CUDA components are uniquely identified, preventing clashes with other libraries like vLLM that might use similar generic names.

Highlights

• Namespace Renaming: The primary change involves renaming the internal C/CUDA extension from _C to _aibrix_C to prevent potential naming conflicts, specifically with vLLM.
• Build System Updates: The CMakeLists.txt file has been updated to reflect the new target and component names (_aibrix_C) for the CUDA extension, ensuring the build process correctly identifies and links the renamed module.
• Python Import and Call Updates: Python code in _custom_ops.py and setup.py has been modified to import and reference the newly named _aibrix_C module and its associated torch.ops functions, maintaining functionality after the rename.

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[gemini-code-assist]

Code Review

This pull request correctly renames the C extension to _aibrix_C to avoid conflicts, and the changes are applied consistently across the build scripts and Python code. I've provided a suggestion in _custom_ops.py to improve maintainability by avoiding repetition of the new extension name.