Server throughput optimizations: reduce GC overhead

[e5l]

Optimizations applied:

• Skip redundant job cancellation in NettyApplicationCall
• Lazy routing trace registration (only when TRACE logging enabled)
• CaseInsensitiveMap: open-addressing hash table (eliminates CaseInsensitiveString allocations)
• HttpProtocolVersion.parse: fast path for HTTP/1.0, HTTP/1.1, HTTP/2.0, HTTP/3.0
• StringValuesImpl: parallel arrays for zero-allocation forEach
• GMTDate: zero-allocation timestamp conversion using civil_from_days algorithm
• LazyThreadSafetyMode.NONE for request-scoped lazy properties

Results (256 byte payload, 64 concurrency):

• Download: 22,713 req/s, 5.55 MB/s
• Upload: 23,529 req/s, 5.74 MB/s
• GC overhead: reduced from ~10.5% to 0.70%

Added throughput benchmark module with:

• Request/response throughput benchmarks
• Big file transfer benchmark (achieved 10.66 Gbps with LocalFileContent, 18.48 Gbps with in-memory)
• async-profiler integration scripts

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch e5l/opt

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