[Deepseek V3.2] Optimize use of dual_stream in nsa_indexer/attention

[hlu1]

Motivation

Modifications

Accuracy Tests

Benchmarking and Profiling

Checklist

• Format your code according to the Format code with pre-commit.
• Add unit tests according to the Run and add unit tests.
• Update documentation according to Write documentations.
• Provide accuracy and speed benchmark results according to Test the accuracy and Benchmark the speed.
• Follow the SGLang code style guidance.
• Work with maintainers to merge your PR. See the PR Merge Process

[gemini-code-assist]

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[Itssshikhar]

hey @Fridge003, just wanted to know if this draft is ready to merge or there still seems to be some work left. happy to take this up.