core[minor], integrations...[patch]: Support ToolCall as Tool input and ToolMessage as Tool output (#24038)

Changes:
- ToolCall, InvalidToolCall and ToolCallChunk can all accept a "type"
parameter now
- LLM integration packages add "type" to all the above
- Tool supports ToolCall inputs that have "type" specified
- Tool outputs ToolMessage when a ToolCall is passed as input
- Tools can separately specify ToolMessage.content and
ToolMessage.raw_output
- Tools emit events for validation errors (using on_tool_error and
on_tool_end)

Example:
```python
@tool("structured_api", response_format="content_and_raw_output")
def _mock_structured_tool_with_raw_output(
    arg1: int, arg2: bool, arg3: Optional[dict] = None
) -> Tuple[str, dict]:
    """A Structured Tool"""
    return f"{arg1} {arg2}", {"arg1": arg1, "arg2": arg2, "arg3": arg3}


def test_tool_call_input_tool_message_with_raw_output() -> None:
    tool_call: Dict = {
        "name": "structured_api",
        "args": {"arg1": 1, "arg2": True, "arg3": {"img": "base64string..."}},
        "id": "123",
        "type": "tool_call",
    }
    expected = ToolMessage("1 True", raw_output=tool_call["args"], tool_call_id="123")
    tool = _mock_structured_tool_with_raw_output
    actual = tool.invoke(tool_call)
    assert actual == expected

    tool_call.pop("type")
    with pytest.raises(ValidationError):
        tool.invoke(tool_call)

    actual_content = tool.invoke(tool_call["args"])
    assert actual_content == expected.content
```

---------

Co-authored-by: Erick Friis <erick@langchain.dev>

libs/partners/mistralai/tests/unit_tests/test_chat_models.py

@@ -144,6 +144,7 @@ def test__convert_dict_to_message_tool_call() -> None:
                 name="GenerateUsername",
                 args={"name": "Sally", "hair_color": "green"},
                 id="abc123",
+                type="tool_call",
             )
         ],
     )
@@ -178,6 +179,7 @@ def test__convert_dict_to_message_tool_call() -> None:
                 args="oops",
                 error="Function GenerateUsername arguments:\n\noops\n\nare not valid JSON. Received JSONDecodeError Expecting value: line 1 column 1 (char 0)",  # noqa: E501
                 id="abc123",
+                type="invalid_tool_call",
             ),
         ],
         tool_calls=[
@@ -185,6 +187,7 @@ def test__convert_dict_to_message_tool_call() -> None:
                 name="GenerateUsername",
                 args={"name": "Sally", "hair_color": "green"},
                 id="def456",
+                type="tool_call",
             ),
         ],
     )