community[patch]: add missing chunk parameter for _stream/_astream (#17807)

- Description: Add missing chunk parameter for _stream/_astream for some
chat models, make all chat models in a consistent behaviour.
- Issue: N/A
- Dependencies: N/A

libs/community/langchain_community/chat_models/ollama.py

@@ -195,6 +195,7 @@ class ChatOllama(BaseChatModel, _OllamaCommon):
                 if run_manager:
                     run_manager.on_llm_new_token(
                         chunk.text,
+                        chunk=chunk,
                         verbose=verbose,
                     )
         if final_chunk is None:
@@ -221,6 +222,7 @@ class ChatOllama(BaseChatModel, _OllamaCommon):
                 if run_manager:
                     await run_manager.on_llm_new_token(
                         chunk.text,
+                        chunk=chunk,
                         verbose=verbose,
                     )
         if final_chunk is None: