[Core] Make V1 work and enable V1 engine test (#389)

1. Make sure the version is string before parse in collect_env
2. Add basic V1 engine test

Signed-off-by: wangxiyuan <wangxiyuan1007@gmail.com>

vllm_ascend/worker/worker_v1.py

@@ -210,7 +210,7 @@ class NPUWorker(WorkerBase):
     def get_model(self) -> nn.Module:
         return self.model_runner.get_model()
 
-    def get_kv_cache_spec(self) -> KVCacheSpec:
+    def get_kv_cache_spec(self) -> dict[str, KVCacheSpec]:
         return self.model_runner.get_kv_cache_spec()
 
     def initialize_from_config(self, kv_cache_config: KVCacheConfig) -> None: