Remove 'get_lan_ip' and add common misc_utils.py (#10880)

### What problem does this PR solve?

Add get_uuid, download_img and hash_str2int into misc_utils.py

### Type of change

- [x] Refactoring

---------

Signed-off-by: Jin Hai <haijin.chn@gmail.com>

rag/benchmark.py

@@ -24,7 +24,7 @@ from api.db import LLMType
 from api.db.services.llm_service import LLMBundle
 from api.db.services.knowledgebase_service import KnowledgebaseService
 from api import settings
-from api.utils import get_uuid
+from common.misc_utils import get_uuid
 from rag.nlp import tokenize, search
 from ranx import evaluate
 from ranx import Qrels, Run