Refa:replace trio with asyncio (#11831)

### What problem does this PR solve?

change:
replace trio with asyncio

### Type of change
- [x] Refactoring

graphrag/search.py

@@ -13,13 +13,13 @@
 #  See the License for the specific language governing permissions and
 #  limitations under the License.
 #
+import asyncio
 import json
 import logging
 from collections import defaultdict
 from copy import deepcopy
 import json_repair
 import pandas as pd
-import trio
 
 from common.misc_utils import get_uuid
 from graphrag.query_analyze_prompt import PROMPTS
@@ -44,7 +44,7 @@ class KGSearch(Dealer):
         return response
 
     def query_rewrite(self, llm, question, idxnms, kb_ids):
-        ty2ents = trio.run(lambda: get_entity_type2samples(idxnms, kb_ids))
+        ty2ents = asyncio.run(get_entity_type2samples(idxnms, kb_ids))
         hint_prompt = PROMPTS["minirag_query2kwd"].format(query=question,
                                                           TYPE_POOL=json.dumps(ty2ents, ensure_ascii=False, indent=2))
         result = self._chat(llm, hint_prompt, [{"role": "user", "content": "Output:"}], {})