Add PR description for benchmark_moe compatibility fixes

Author: massif-01

PR_DESCRIPTION.md

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+Title: Enhance benchmark_moe.py: vLLM Version Compatibility Fixes
+
+Description:
+This PR introduces compatibility fixes to `benchmarks/kernels/benchmark_moe.py` to support multiple vLLM versions and prevent runtime import/parameter errors. The following issues are addressed:
+
+1. ImportError: cannot import name '_get_config_dtype_str'
+   - Added a multi-level import fallback that searches possible module locations and class methods for `_get_config_dtype_str` and provides a fallback implementation when unavailable.
+
+2. TypeError: FusedMoEQuantConfig.make() parameter incompatibility
+   - Implemented `make_quant_config_compatible()` which tries multiple parameter combinations (including `quant_dtype`, `dtype`, with/without `block_quant_shape`) to create `FusedMoEQuantConfig` across versions.
+
+3. TypeError: fused_experts() parameter incompatibility
+   - Implemented `fused_experts_compatible()` which inspects `fused_experts` signature and only passes supported parameters (`quant_config`, `allow_deep_gemm`, etc.).
+
+Notes:
+- No change to the benchmark algorithm logic.
+- All output messages are in English and suitable for production logs.
+- These fixes aim to support vLLM 0.6.0+ through 0.10.0+ releases.
+
+Please review and let me know if you'd like additional cleanups or unit tests included.