Move 'timeout' to common folder (#10983)

### What problem does this PR solve?

As title.

### Type of change

- [x] Refactoring

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

rag/flow/base.py

@@ -20,7 +20,7 @@ from functools import partial
 from typing import Any
 import trio
 from agent.component.base import ComponentBase, ComponentParamBase
-from api.utils.api_utils import timeout
+from common.connection_utils import timeout
 
 
 class ProcessParamBase(ComponentParamBase):

rag/flow/tokenizer/tokenizer.py

@@ -23,7 +23,7 @@ from api.db import LLMType
 from api.db.services.knowledgebase_service import KnowledgebaseService
 from api.db.services.llm_service import LLMBundle
 from api.db.services.user_service import TenantService
-from api.utils.api_utils import timeout
+from common.connection_utils import timeout
 from rag.flow.base import ProcessBase, ProcessParamBase
 from rag.flow.tokenizer.schema import TokenizerFromUpstream
 from rag.nlp import rag_tokenizer