Add extra_body field to LLMConfig dataclass for Azure AI Search suppo…

…rt (microsoft#2011)

Co-authored-by: Chi Wang <wang.chi@microsoft.com>

samples/apps/autogen-studio/autogenstudio/datamodel.py

@@ -93,6 +93,7 @@ class LLMConfig:
     cache_seed: Optional[Union[int, None]] = None
     timeout: Optional[int] = None
     max_tokens: Optional[int] = None
+    extra_body: Optional[dict] = None
 
     def dict(self):
         result = asdict(self)