community[patch]: support convert FunctionMessage for Tongyi (#23569)

**Description:** For function call agent with Tongyi, cause the
AgentAction will be converted to FunctionMessage by

47f69fe0d8/libs/core/langchain_core/agents.py (L188)
But now Tongyi's *convert_message_to_dict* doesn't support
FunctionMessage

47f69fe0d8/libs/community/langchain_community/chat_models/tongyi.py (L184-L207)
Then next round conversation will be failed by the *TypeError*
exception.

This patch adds the support to convert FunctionMessage for Tongyi.

**Issue:** N/A
**Dependencies:** N/A

libs/community/langchain_community/chat_models/tongyi.py

@@ -32,6 +32,7 @@ from langchain_core.messages import (
     BaseMessageChunk,
     ChatMessage,
     ChatMessageChunk,
+    FunctionMessage,
     HumanMessage,
     HumanMessageChunk,
     SystemMessage,
@@ -202,6 +203,13 @@ def convert_message_to_dict(message: BaseMessage) -> dict:
             "content": message.content,
             "name": message.name,
         }
+    elif isinstance(message, FunctionMessage):
+        message_dict = {
+            "role": "tool",
+            "tool_call_id": "",
+            "content": message.content,
+            "name": message.name,
+        }
     else:
         raise TypeError(f"Got unknown type {message}")
     return message_dict

libs/community/tests/unit_tests/chat_models/test_tongyi.py

@@ -1,5 +1,6 @@
 from langchain_core.messages import (
     AIMessage,
+    FunctionMessage,
     HumanMessage,
     SystemMessage,
 )
@@ -83,3 +84,15 @@ def test__convert_message_to_dict_system() -> None:
     result = convert_message_to_dict(message)
     expected_output = {"role": "system", "content": "foo"}
     assert result == expected_output
+
+
+def test__convert_message_to_dict_tool() -> None:
+    message = FunctionMessage(name="foo", content="bar")
+    result = convert_message_to_dict(message)
+    expected_output = {
+        "role": "tool",
+        "tool_call_id": "",
+        "content": "bar",
+        "name": "foo",
+    }
+    assert result == expected_output