[v0.11.0][bugfix]kvpool sync load (#3698) (#3722)

### What this PR does / why we need it?
In certain scenarios, the performance of synchronously loading data from
the pool is better than that of asynchronously loading data. Therefore,
a control logic (or switch) for asynchronous loading from the pool has
been added.
### Does this PR introduce _any_ user-facing change?

### How was this patch tested?

- vLLM version: v0.11.0rc3
- vLLM main: https://github.com/vllm-project/vllm/commit/v0.11.0

---------

<!--  Thanks for sending a pull request!

BEFORE SUBMITTING, PLEASE READ
https://docs.vllm.ai/en/latest/contributing/overview.html

Signed-off-by: fems14 <1804143737@qq.com>

vllm_ascend/distributed/mooncake/mooncake_store.py

@@ -65,15 +65,15 @@ class Mooncakestore():
             logger.error(msg)
             raise RuntimeError(msg)
 
-    def set_kv_caches(self, kvcache):
-        self.kvcache = list(kvcache)
-
     def exists(self, key: MooncakeEngineKey) -> bool:
         return self.store.is_exist(key.to_string()) == 1
 
     def batch_exists(self, keys: list[str]) -> list[bool]:
         return self.store.batch_is_exist(keys)
 
+    def register_buffer(self, ptr, length):
+        return self.store.register_buffer(ptr, length)
+
     def get_batch(self, keys: list[str], addrs: list[list[int]],
                   sizes: list[list[int]], block_ids: list[int]):
         try: