[Model] Add multi-image support for minicpmv (#7122)

Co-authored-by: hezhihui <hzh7269@modelbest.cn>
Co-authored-by: Cyrus Leung <cyrus.tl.leung@gmail.com>

tests/conftest.py

@@ -3,7 +3,7 @@ import gc
 import os
 import sys
 from collections import UserList
-from typing import Any, Dict, List, Optional, Tuple, TypedDict, TypeVar
+from typing import Any, Dict, List, Optional, Tuple, TypedDict, TypeVar, Union
 
 import pytest
 import torch
@@ -508,7 +508,8 @@ class VllmRunner:
         prompts: List[str],
         max_tokens: int,
         num_logprobs: int,
-        images: Optional[List[Image.Image]] = None,
+        images: Optional[Union[List[Image.Image],
+                               List[List[Image.Image]]]] = None,
         stop_token_ids: Optional[List[int]] = None,
     ) -> List[Tuple[List[int], str, Optional[SampleLogprobs]]]:
         greedy_logprobs_params = SamplingParams(temperature=0.0,