[Misc] Move utils to avoid conflicts with stdlib, and move tests (#27169)

Signed-off-by: DarkLight1337 <tlleungac@connect.ust.hk>

vllm/transformers_utils/processor.py

@@ -16,7 +16,7 @@ from transformers.processing_utils import ProcessorMixin
 from transformers.video_processing_utils import BaseVideoProcessor
 from typing_extensions import TypeVar
 
-from vllm.utils.functools import get_allowed_kwarg_only_overrides
+from vllm.utils.func_utils import get_allowed_kwarg_only_overrides
 
 if TYPE_CHECKING:
     from vllm.config import ModelConfig