core: Runnable pass kwargs to _astream_log_implementation in astream_…

…log (langchain-ai#19055)

- **Description:** When calling the `_stream_log_implementation` from
the `astream_log` method in the `Runnable` class, it is not handing over
the `kwargs` argument. Therefore, even if i want to customize APIHandler
and implement additional features with additional arguments, it is not
possible. Conversely, the `astream_events` method normally handing over
the `kwargs` argument.
- **Issue:** langchain-ai#19054
- **Dependencies:**
- **Twitter handle:** if your PR gets announced, and you'd like a
mention, we'll gladly shout you out!

Co-authored-by: hyungwookyang <hyungwookyang@worksmobile.com>

libs/core/langchain_core/runnables/base.py

@@ -815,6 +815,7 @@ async def astream_log(
             diff=diff,
             stream=stream,
             with_streamed_output_list=with_streamed_output_list,
+            **kwargs,
         ):
             yield item