[Feature] implement eagle spec decoding for model runner v2 (#5840)

### What this PR does / why we need it?
this pr implement eagle spec decoding for model runner v2, please see
RFC https://github.com/vllm-project/vllm-ascend/issues/5208

### Does this PR introduce _any_ user-facing change?
No

### How was this patch tested?
vLLM version: v0.13.0

---------

Signed-off-by: Ronald1995 <ronaldautomobile@163.com>

vllm_ascend/patch/__init__.py

@@ -174,7 +174,8 @@
 #
 # ** 6. File: worker/patch_triton.py**
 # ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-#   1. `vllm.model_executor.layers.mamba.ops`, `vllm.model_executor.layers.fla.ops`
+#   1. `vllm.model_executor.layers.mamba.ops`, `vllm.model_executor.layers.fla.ops`,
+#      `vllm.v1.worker.gpu.sample.gumbel.gumbel_sample`
 #    Why:
 #       triton ops in vLLM perform not good on NPU. And there is no dispatch mechanism for triton ops.
 #    How：
@@ -263,3 +264,15 @@
 #    Future Plan:
 #       Remove this patch when vLLM support these operators.
 #
+# ** 12. File: worker/patch_v2_eagle.py**
+# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+#   1. `vllm.v1.worker.gpu.spec_decode.eagle.EagleSpeculator.propose`
+#    Why:
+#       `propose` method use torch.gather, but the gather operator will
+#       pollute the arguments passed to it. the bug is reported to huawei
+#       CANN team, but not fixed yet.
+#    How：
+#       clone the out attribute ahead of gather to avoid the bug.
+#    Future Plan:
+#       Remove this patch when cann fix the gather bug.
+#