partners[openai]: Add name field to tool message to match OpenAI spec (#23551)

Discovered alongside @t968914

  - **Description:**
According to OpenAI docs, tool messages (response from calling tools)
must have a 'name' field.

https://cookbook.openai.com/examples/how_to_call_functions_with_chat_models

  - **Issue:** N/A (as of right now)
  - **Dependencies:** N/A
  - **Twitter handle:** N/A

Additional guidelines:
- Make sure optional dependencies are imported within a function.
- Please do not add dependencies to pyproject.toml files (even optional
ones) unless they are required for unit tests.
- Most PRs should not touch more than one package.
- Changes should be backwards compatible.
- If you are adding something to community, do not re-import it in
langchain.

If no one reviews your PR within a few days, please @-mention one of
baskaryan, efriis, eyurtsev, ccurme, vbarda, hwchase17.

libs/partners/openai/langchain_openai/chat_models/base.py

@@ -219,7 +219,7 @@ def _convert_message_to_dict(message: BaseMessage) -> dict:
         message_dict["role"] = "tool"
         message_dict["tool_call_id"] = message.tool_call_id
 
-        supported_props = {"content", "role", "tool_call_id"}
+        supported_props = {"content", "role", "tool_call_id", "name"}
         message_dict = {k: v for k, v in message_dict.items() if k in supported_props}
     else:
         raise TypeError(f"Got unknown type {message}")