[Feature] support aclgraph for model runner v2 (#7110)

### What this PR does / why we need it?
This PR aims to support aclgraph for model runner v2, please see RFC
#5208. The PR contains these modifications:
- adapt to newest commit of vllm main branch.
- supply a unified interface of extra forward context for both model
runner v1 and model runner v2.
- implement graph mode for main model. 

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

### How was this patch tested?

- vLLM version: v0.16.0
- vLLM main:
4034c3d32e

---------

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

vllm_ascend/worker/v2/README.md

@@ -5,4 +5,5 @@ This directory contains the new model runner which is under active development.
 please see [Model Runner V2](https://github.com/vllm-project/vllm-ascend/issues/5208)
 to get specific plans.
 
-supported vllm version: main@1339784
+supported vllm version: main@4034c3d32e30d01639459edd3ab486f56993876d
+related PR: <https://github.com/vllm-project/vllm-ascend/pull/7110>