Tidy vllm/config/__init__.py to only add classes and functions (#26405)

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

tests/models/utils.py

@@ -10,7 +10,7 @@ import torch
 import torch.nn.functional as F
 from transformers import PretrainedConfig
 
-from vllm.config import ModelConfig, ModelDType, RunnerOption
+from vllm.config.model import ModelConfig, ModelDType, RunnerOption
 from vllm.logprobs import Logprob, PromptLogprobs, SampleLogprobs
 from vllm.multimodal.processing import InputProcessingContext
 from vllm.transformers_utils.tokenizer import cached_tokenizer_from_config