community[patch]: callback before yield for _stream/_astream (#17907)

- Description: callback on_llm_new_token before yield chunk 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

@@ -318,6 +318,7 @@ class ChatOllama(BaseChatModel, _OllamaCommon):
                     if run_manager:
                         run_manager.on_llm_new_token(
                             chunk.text,
+                            chunk=chunk,
                             verbose=self.verbose,
                         )
                     yield chunk
@@ -337,6 +338,7 @@ class ChatOllama(BaseChatModel, _OllamaCommon):
                 if run_manager:
                     await run_manager.on_llm_new_token(
                         chunk.text,
+                        chunk=chunk,
                         verbose=self.verbose,
                     )
                 yield chunk
@@ -356,6 +358,7 @@ class ChatOllama(BaseChatModel, _OllamaCommon):
                 if run_manager:
                     run_manager.on_llm_new_token(
                         chunk.text,
+                        chunk=chunk,
                         verbose=self.verbose,
                     )
                 yield chunk