Move ModelConfig from config/__init__.py to config/model.py (#25252)

Signed-off-by: Harry Mellor <19981378+hmellor@users.noreply.github.com>

tests/conftest.py

@@ -39,7 +39,8 @@ from vllm import LLM, SamplingParams
 from vllm.assets.audio import AudioAsset
 from vllm.assets.image import ImageAsset
 from vllm.assets.video import VideoAsset
-from vllm.config import ConvertOption, RunnerOption, _get_and_verify_dtype
+from vllm.config.model import (ConvertOption, RunnerOption,
+                               _get_and_verify_dtype)
 from vllm.connections import global_http_connection
 from vllm.distributed import (cleanup_dist_env_and_memory,
                               init_distributed_environment,