[Chore]: Reorganize model repo operating functions in transformers_utils (#29680)

Signed-off-by: Isotr0py <mozf@mail2.sysu.edu.cn>

vllm/engine/arg_utils.py

@@ -83,10 +83,10 @@ from vllm.platforms import CpuArchEnum, current_platform
 from vllm.plugins import load_general_plugins
 from vllm.ray.lazy_utils import is_in_ray_actor, is_ray_initialized
 from vllm.transformers_utils.config import (
-    get_model_path,
     is_interleaved,
     maybe_override_with_speculators,
 )
+from vllm.transformers_utils.repo_utils import get_model_path
 from vllm.transformers_utils.utils import is_cloud_storage, is_gguf
 from vllm.utils.argparse_utils import FlexibleArgumentParser
 from vllm.utils.mem_constants import GiB_bytes