feat: add rmsnorm_h4096 workloads and baseline solution

#4

Summary

Add 14 workloads (JSONL, inline tensors) for rmsnorm_h4096
Baseline solution using flashinfer.norm.rmsnorm
Definition JSON and reference test

Kernel: Qwen3.5-35B-A3B rmsnorm h4096
Companion PR: flashinfer-ai/flashinfer-bench#310

Test plan

Reference test passes on GPU
14 workloads collected from real Qwen3.5-35B-A3B inference

Generated with Claude Code

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