[Feature] adapt to uva buffer and main2main (#6657)

### What this PR does / why we need it?
vllm model runner v2 use uva buffer to prepare input data, but npu
doesn't support uva yet, this pr implement a uvawrapper class to mimic
gpu's uva backend. what's more, this pr make some modifications to adapt
to the newer main branch.

### Does this PR introduce _any_ user-facing change?
no
### How was this patch tested?
- vLLM main:
13397841ab

---------

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

vllm_ascend/patch/__init__.py

@@ -263,3 +263,12 @@
 #       https://gitcode.com/Ascend/torchair/pull/2575
 #    Future Plan:
 #       Remove this patch when the PTA version used by vllm-ascend has been upgraded.
+# ** 14. File: worker/patch_v2_uva.py**
+# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+#   1. `vllm.v1.worker.gpu.states.UvaBuffer`
+#    Why:
+#       ASCEND NPUs do not support UVA yet, so we need to wrap it in vLLM.
+#    How：
+#       make UvaBuffer a dummy class, mimic the interface of vllm UvaBuffer.
+#    Future Plan:
+#       Remove this patch when NPU support UVA.