[Fusion] [Graph] Add qknorm rope fusion operator (#4711)

### What this PR does / why we need it?
This PR add `qkv_rmsnorm_rope` operator and introduces a graph fusion
pass for `qknorm_rope` operations. The implementation includes a new
configuration flag, a pattern matching pass using
`torch._inductor.pattern_matcher`, and a custom Triton kernel for the
fused operation.

Co-authored-by: Angazenn
[supperccell@163.com](mailto:supperccell@163.com)

### Does this PR introduce _any_ user-facing change?
Yes, add new additional_config

- vLLM version: v0.12.0
- vLLM main:
ad32e3e19c

---------

Signed-off-by: wxsIcey <1790571317@qq.com>

vllm_ascend/compilation/graph_fusion_pass_manager.py

@@ -50,4 +50,7 @@ class GraphFusionPassManager:
             from .passes.norm_quant_fusion_pass import \
                 AddRMSNormQuantFusionPass
             self.passes.append(AddRMSNormQuantFusionPass(config))
-        # Add more passes here as needed
+
+        if self.ascend_compilation_config.get("fuse_qknorm_rope", True):
+            from .passes.qknorm_rope_fusion_pass import QKNormRopeFusionPass
+            self.passes.append(QKNormRopeFusionPass(config))