`.register_tool()` should accept `Tool`s

[gadenbuie]

import chatlas

def get_weather_forecast(
    lat: float, lon: float, location_name: str
) -> dict[str, str]:
    """Get the weather forecast for a location."""
    # Mocked weather data for demonstration purposes
    return {"temperature_2m": 18, "condition": "Partly Cloudy"}
    
weather_tool = chatlas.Tool.from_func(get_weather_forecast)

chat = chatlas.ChatOpenAI()
chat.register_tool(weather_tool)
#> Argument of type "Tool" cannot be assigned to parameter "func" of type "((...) -> Any) | ((...) -> Awaitable[Any])" in function "register_tool"
#>   Type "Tool" is not assignable to type "((...) -> Any) | ((...) -> Awaitable[Any])"
#>     Type "Tool" is not assignable to type "(...) -> Any"
#>     Type "Tool" is not assignable to type "(...) -> Awaitable[Any]"PyrightreportArgumentType

You can get around this with a chat.set_tools() dance, which is not ideal.

chat.set_tools([*chat.get_tools(), weather_tool])